The best answers address the question directly, and back up facts with wikilinks and links to sources. Do not edit others' comments and do not give any medical or legal advice.
In my geometry class, we watched this video about dimensions. It had this city of two-dimensional shapes that weren't aware of a third dimension (can't remember the name of this particular film). It just got me wondering if there was a fourth dimension, and if our minds would be able to comprehend it. What could the fourth dimension be? The mind? Space? Something with the senses? Can we even begin to imagine what it could be? How could we discover it? Thanks.2602:306:CC43:A8A0:C8A1:D21E:F7DC:74C1 (talk) 00:12, 8 October 2015 (UTC)[reply]
There is a fourth dimension, time. Whenever you specify the location of an object, you need to include the 3 spacial dimensions but also the time, as the object won't be there permanently (although some things seems permanent, on a human timescale, so the time dimension is often omitted for things like mountains). StuRat (talk) 00:27, 8 October 2015 (UTC)[reply]
As far as I know, the problem with extra spatial dimensions is that they might be expected to consume particles, forces, and so forth. A radioactive atom breaks - the pieces go left and right, up and down, back and forth, why not zerk and krez? But we see every particle come out, in normal 3D space, by seemingly normal laws of Euclidean physics. In M-theory there is this idea that there are extra dimensions but they are "curled up", so you go the tiniest smidgeon of a nothing in them and you're back to where you started. Sort of like beads on a string - they seem confined to a one-dimensional space but if you look really close you can see they are able to rattle back and forth a bit too, rotate etc. But honestly I still don't really understand that, because wouldn't a particle looping around and round in a fourth dimension have energy diverted to its motion in that space that leaves it going too slow in regular space? But since M-theory ties these states to various physical forces, I am probably missing the point. Wnt (talk) 00:47, 8 October 2015 (UTC)[reply]
In at least some of these models, possibly all, particles are spread evenly across the extra dimensions in a low-frequency (so also low-energy) mode, analogous to a transverse mode of a waveguide. To get something resembling motion in the extra dimension, you'd need to excite higher-frequency modes, but their energy is high enough that they haven't been seen in experiments.
Zerk and krez? I am not even going to ask permission to steal that. What a great thread. I read Flatland back in the 80's when there was no non-public domain version of it. Great thread. Am off to look zerk and krezward for the 2007 film. μηδείς (talk) 01:25, 8 October 2015 (UTC)[reply]
It's not clear that the OP is really talking about geometry. He/she asked what was "the" fourth dimension. Many many people seem to think that's somehow a meaningful question. I would ask those people, what is "the" first dimension? Is it left/right? Is it north/south? Or maybe galactic north and galactic south? Up/down? Forwards/backwards? In any of those cases, what makes that the first one?
If you can't figure out what the first one is, how are you going to figure out the fourth one?
Furthermore, in mathematics, the term "dimension" has a specific meaning. Often, when real scientists and physicists talk about multiple dimensions, they are not talking about spatial coordinates. This terminology frequently confuses readers of popular-science who have not formally studied mathematics and physics. For example, we have an article on parameter spaces and configuration spaces. Scientists may use the term "dimension" to represent one coordinate in these abstract or generalized models.
StuRat mentioned spacetime and Vespine mentioned Euclidean four-space, but please note that these are not the same thing. Spacetime has a Minkowski geometry in which time has to be distinguished from the spatial dimensions. Special relativity can be expressed as rotations between time and space, but they're not quite the rotations with which you're familiar. —Tamfang (talk) 09:52, 8 October 2015 (UTC)[reply]
Well, sort of. There are "timelike" and "spacelike" directions, and those can be distinguished in a coordinate-free way. However, there is no distinguished "pure time" dimension. --Trovatore (talk) 18:25, 8 October 2015 (UTC)[reply]
We've answered this question several times before - and I've come to the following view. Let's lay out some assumptions and ground rules:
I'm assuming that we're taking a standard "3D" human with normal eyes and brain and dumping them into a world with four spatial dimensions and one time dimension.
This being the case, we need to imagine how our current visual system would react to being in this strange place.
Note that we have two eyes, spaced a little way apart in a direction determined by turning our heads.
Note that our retinas are not 3D "cameras" - they are (essentially) 2D cameras - we see a projective projection of the 3D scene onto a pair of 2D retinas.
We see a slightly different 2D projection of the three dimensional scene in each of our two eyes and we have to focus to make a sharp image on the retina - and the degree of focus, and the degree of adjustment between the two images to make them 'fuse' into a single image allows our brain to calculate an estimate the third dimension distance.
So what happens?
Well, for starters, in the 3D world, our eyeballs are solid walls with a hole in the front - this ensures that light only enters the eye through lens and iris. In a 4D world, light can cleanly bypass those solid walls and light from all directions would hit the retina. This would effectively render us blind. We'd see a uniform sea of light coming from all directions.
Imagine the 2D analogy. A circle in 2D completely surrounds the space inside it - but in 3D, you can shine a flashlight onto a 2D circle and light up its interior...and the same thing happens with a 3D sphere in a 4D world.
If instead we imagine that the spheres that are our eyes are hyperspheres in 4D - then what becomes of our retinas? If they remain as essentially 2D surfaces then what we'd see would be just like a projection of the 3D world into 2D...things would look entirely normal until you turned your head in the 4th direction - when you "turn your head" in the 4th direction - then the world would morph and shift bizarrely - but it would still look like our 3D world.
If we imagine that we magically have 3D retinas in 4D eyeballs - then we have to imagine how those retinas are connected to our brains. Our brains aren't large enough to incorporate all of data from the millions time greater numbers of light-sensing cells. If you follow that direction of thinking then all bets are off. In order to be able to see anything 'unusual' about the 4th dimension, we'd have to be fully 4D creatures - and we'd be very, very different.
So different, that it wouldn't be meaningful to call us human anyway.
Bottom line - it all depends on your assumptions about how we are in the 4D world. If unchanged, we can't see anything beyond a uniform bright blur - and if we're sufficiently changed, then it becomes meaningless to ask how we'd see things - because we wouldn't be remotely human and we can't imagine the answer.
05:27, 11 October 2015 (UTC)
The question seems most likely to arise for a brain-in-vat who's given a 4D virtual environment, and virtual eyeballs. I imagine a space E³×S¹, where the extra dimension is initially such a tiny circle that variation of that coordinate has essentially no effect, but slowly grows as the subject gains familiarity until the circle is too long to notice the wrapping. —Tamfang (talk) 08:00, 11 October 2015 (UTC)[reply]
The differences between those two scenes allow us to (somewhat) deduce a distance in the direction that's perpendicular to the take one 2D image from each eye and combine them to produce a means to get an approximate idea of distance in that 3rd direction...the direction that's at right angles to the line joining our two eyes and in the general direction that they are pointing.
I have read the article in german and I have 2 questions: The first is above and the second is:
is he able to eat the pure tobacco plant (like snails) or does him harm this scent of a blossoming tobacco plant? (such as mosquitoes or bees, for example).
Reading the german and the english article does make me feel, like he is only eating tobacco products, not the pure plant himself when it is growing. Am I right? Because this would make my question even harder, why a beetle what isn´t living with the tobacco plant has got this name..
here is a 1:1 translate of the german part with google translate what this beetle is able to eat (I have not corrected it, just if someone wants to grew the article about Lasioderma serricorne) numerous foods, such as flour, dried fruits, such as dates and raisins, cereals, cocoa, coffee beans, spices and herbs, nuts, rice, animal-dried foods and other foods that chambers extended period in storage cabinets, and stored like. In addition, you will find the beetles also dried plants, as in herbaria, decorations and potpourris, in medicines, in insect preparations, in filling of furniture, paper mache and the binding glue of books. Thank you and greetings!--Hijodetenerife (talk) 05:48, 8 October 2015 (UTC)[reply]
The tobacco beetle is so named because of the tremendous economic damage he incurs upon tobacco farmers. The beetle will eat either the leaves off the live plant, or the aging tobacco being stored in a warehouse. Tobacco beetles will also eat virtually any dried vegetable matter. I have not been able to find out who so named the beetle or when. I suspect that history is buried in an 18th century Latin or German manuscript. If you do manage to find some of the sources cited in the history section of this paper, maybe you could find out. Someguy1221 (talk) 23:46, 8 October 2015 (UTC)[reply]
The article doesn't answer a question. Does the tobacco beetle have a resistance to nicotine? The nicotine alkaloid is commonly used as an insecticide, and it is plausible that the plant developed the production of the alkaloid precisely because it is a very good insecticide, and so would protect the plant from most species of insects. I am conjecturing that this species of beetle has adapted to its environment by acquiring a resistance to the insecticide. Maybe it was so named both because it causes economic damage to tobacco and because it was seen to be one of the very few pests that could cause damage to tobacco (since the plant protects itself otherwise by being poisonous.) Robert McClenon (talk) 22:16, 9 October 2015 (UTC)[reply]
list of chemicals in blood that increase when a person goes into physical exertion mode
The concentration of blood lactate is usually 1–2 mmol/L at rest, but can rise to over 20 mmol/L during intense exertion. Immune cell functions are impaired following acute sessions of prolonged, high-intensity exercise, and some studies have found that athletes are at a higher risk for infections. Athletes may have slightly elevated Natural killer cell count and cytolytic action, but these are unlikely to be clinically significant Bestfaith (talk) 18:04, 8 October 2015 (UTC)[reply]
I don't know much about this to be honest. But for each of the things you are interested in, check the WP article. For instance Cortisol#Normal_levels and Cortisol#Factors_increasing_cortisol_levels give some info on the (wide) normal range in blood, and also indicated that aerobic exercise can increase blood cortisol. While "things that increase in the blood during exercise" is indeed an interesting category, I don't know of any place to find a comprehensive list. SemanticMantis (talk) 15:00, 9 October 2015 (UTC)[reply]
The muscles used in exercise are powered by oxidation of fats and carbohydrates using oxygen that is transported in red blood cells. A protein Hemoglobin in the blood cells binds with oxygen molecules in the lungs to form Oxyhemoglobin and on releasing oxygen returns to deoxyhemoglobin. A pulse oximeter (shown) can measure the amount of oxygen in a person's blood because oxyhemoglobin and deoxyhemoglobin have different absorption spectra. Bestfaith (talk) 17:27, 9 October 2015 (UTC)[reply]
According to Himalayas#Geology, the plate tectonics driving this rise are expected to continue for another 10 million years. However, the current rate at which the Himalayas are rising, 5mm per year, is unsustainable over that time period (it leads to an absurd prediction that the Himalayas will eventually rise to 37 miles in height, which is thicker than the plates themselves). So we have predictions for how long the subduction of the Indian subcontinent will continue, but I haven't seen predictions on when the mountains themselves will stop getting higher, or if they'll collapse under their own weight. Someguy1221 (talk) 00:36, 9 October 2015 (UTC)[reply]
If first frost is November or October then when does plant volume peak?
As in cubic meters of organisms per acre.
Google says deciduous trees only grow a few months a year, so they must peak for an extended period until they start losing leaves. Species like maples might slowly decline for months as they seem to start losing seeds early. Do some weeds that are annuals grow until frost kills them, even if it's once in 30 years late? Or is a period of no growth (besides seeds) a normal part of annual weeds' lives? Are there any rules of thumb like grasses growing the latest or trees stopping growth earlier than bushes? Are there any common humid continental annuals in nature that shrink (besides seed or fruit loss) before frost hurts them? (possibly to cannibalize less vital anatomy for resources to make seeds?) Sagittarian Milky Way (talk) 09:24, 9 October 2015 (UTC)[reply]
Bottom panel: Seasonal cycle in atmospheric CO2 is driven by terrestrial NPP in the northern hemisphere. This is very interesting stuff! However, I don't have much time today to give a full account. You can ping me next week if you want more refs. First, plants age through senescence. Most grasses and deciduous trees do retranslocation. Sadly we don't seem to have a good WP article, see e.g. these research articles [1][2][3]. What this means is that much of the N and other nutrients is pulled out of the leaves before they fall or die back. This also applies to most annual weeds, and retranslocation starts to happen well before first frost.
Better graph showing how NPP draws down atmospheric CO2. In this case for Harvard Forest, peak biomass should occur sometime in June.The timing is always a bit of a guessing game, and many ruderal plants have indeterminate growth. Plants take cues from photoperiod, temperature, moisture, and even the color of light to "decide" when to do certain things like germinate, set seed, senesce, etc. So sometimes a freak early frost will kill green plants, and sometimes if the frost comes late there will be a few plants that took the risks to hang on longer. The study of plant phenology is vast and currently fairly in vogue, in part because climate change is mucking things up, and when plants and animals follow different cues events that used to match up no longer coincide, and lots of things die. Identifying exactly which cues which plants and animals use is tough, and there's almost always considerable variability within species. As an anecdote, I worked at a lab once where they studied Carduus as a model species. The plants are described as facultative biennials or short-lived perennials. They normally set seed in the fall, form rosettes, over winter, then bolt the next year, if they have the right amounts of light, water, and nutrients. But in odd conditions, they can live for over 12 years!
Now, as for plant volume - that will be hard to find - most systems ecology discusses things in terms of dry biomass. Converting to and from wet biomass isn't too hard, but allometry means it's very hard to go from biomass to volume, even within one species. Also, due to the retranslocation, biomass of a deciduous forest doesn't fluctuate as much as you might think [4].
What does vary quite a bit is Net primary productivity. For example, the seasonal carbon flux to the terrestrial carbon sink is highly dominated by northern hemisphere forests. So when you look at the seasonal cycle in CO2, what you're seeing is the effect of plant growth drawing it down in North American spring. I can't see an isolated graph of this on WP but see the bottom panel of fig1 in Carbon_dioxide_in_Earth's_atmosphere. So in much of the USA and Europe, plant growth is fastest when the slope of atmospheric CO2 is the most negative, and the highest biomass will tend to be when the CO2 value bottoms out for the year. There's of course a lot more going on, but this is the basics of how plant growth and seasonality work out.
If you have a specific region of the world in mind, then you can get local NPP estimates through the Ameriflux and Fluxnet projects, and you can also get local phenological info through a phenology network. Here is the website for the USA national network [5], I believe there are analogs for other regions. Hope that helps, SemanticMantis (talk) 15:23, 9 October 2015 (UTC)(ETA: found a better graph at ecosystem ecology.)[reply]
what factors (deficiencies, surpluses, exposures etc) cause increased rate of cell death and decreased rate of regeneration, leading to incidents such as more-often spontaneous bleeding, bruising, scarring etc
I know that it is a thing in that it's something that's discussed on the 'net, but is it an established medical procedure somewhere, and does it work? I've found no reliable sources, but lots of mentions on forums and similar, and apparently autocircumcision has been deleted three times. To clarify, I'm talking about "training" the foreskin to remain retracted and look like a circumcision. I ask because I've run across a crosswiki IP editor who adds images without supporting sources to articles about circumcision, foreskin and balanitis, like here and here. To me it looks very much like an excuse to post "dick pics" or to promote some fringe view. Sjö (talk) 11:46, 9 October 2015 (UTC)[reply]
The article about Balanitis, an inflammation of the glans penis, cites several reliable sources that indicate circumcision is often the preferred treatment. Possible alternatives to circumcision may be laser treatment (Baldwin HE, Geronemus RG (1989). "The treatment of Zoon's balanitis with the carbon dioxide laser". J Dermatol Surg Oncol 15 (5): 491–4) or use of the silicon retraction ring. The latter is alleged in fora in anonymous posts that link to Wikipedia illustrations but I find no peer reviewed study of the medical effectiveness of the misnamed ornament that simulates a circumcision temporarily. Bestfaith (talk) 18:10, 9 October 2015 (UTC)[reply]
So, if I read that correctly, the foreskin can be "trained" to stay withdrawn, but not by using a silicone penis ring like in the images? Sjö (talk) 04:38, 12 October 2015 (UTC)[reply]
@Sjö: No, I have not either and I would not expect a vetted secondary source to endorse the misleading term. If one could verify A doctor from Saginaw, Michigan writing in 1951 coined the term "autocircumcision" that is claimed here one might find a WP:RS. Bestfaith (talk) 17:51, 11 October 2015 (UTC)[reply]
Material effective in damping (cushioning) free falls from supertall buildings
Which material is the most effective in damping (cushioning) man's free fall from supertall buildings like Burj Khalifa and how thick such a material should be? By effective I mean absorption of terminal velocity of a free-falling man, so no injuries (or only minimal bruises) are inflicted. Just for theoretical interest, not because I'm intending to do so.--93.174.25.12 (talk) 17:43, 9 October 2015 (UTC)[reply]
Fire rescue air cushions are often deployed to save lives of forced or voluntary (suicidal) jumpers from high buildings. This range of cushions need minutes to inflate with motors and are claimed to be useful for jumping heights up to 45 m. They are designed with 2 or 3 successive air chambers. The terminal velocity of a person in face down free fall position is about 195 km/h (122 mph or 54 m/s) which is a survivable fall on a sufficiently large cushion; however a head-down position as adopted by speed skydivers will greatly increase his/her velocity and probability of death. Bestfaith (talk) 18:38, 9 October 2015 (UTC)[reply]
Although they're still a subject of ongoing research, auxeticmetamaterials look promising for that. That said, when it comes to jumping off Burj Khalifa, I'd rather have a parachute. (Come to think of it, even taking the stairs seems preferable to jumping off, regardless off parachutes or cushions or whatnot.) --Link(t•c•m)21:15, 9 October 2015 (UTC)[reply]
Pictures of "aliens" often use the same sort of features, with a tall, thin body, a triangular shaped head, big dark eyes and a neutral expression. Assuming no governments have revealed actual evidence of extraterrestrials, what is this image based on? 2.216.10.148 (talk) 23:00, 9 October 2015 (UTC)[reply]
The classic fictional aliens, the greys, can be sourced at least back to an 1893 work by HG Wells. Wells argued that increasing reliance on technology would cause physical traits he deemed unnecessary to disappear or shrink, such as hair, ears, pronounced nose and brow ridge, and the mouth (which would shrink if not disappear)[6]. Was this his honest prediction as to what technologically advanced life would look like, or just a post-hoc explanation for an appearance he desired for fictional subjects? I don't know. I should note that in its original form, this was a proposal for what humans would look like in the distant future, but the image got co-opted (including by Wells himself) for use by fictional aliens. Someguy1221 (talk) 23:28, 9 October 2015 (UTC)[reply]
Let's look at some characteristics:
"Tall, thin body". That would make sense in a low gravity planet, such as Mars.
"Neutral expression". It would be unlikely we would be able to read each other's expressions, so we would each appear to have blank expressions to each other. ("It just held it's third tentacle at a 45 degree angle, does that mean it's angry ?")
"Big, dark eyes". Useful in low light levels, or if they are nocturnal. (The dark part being due to a larger opening for light.)
"Triangular head". This is common in insects, so I would guess they just choose that so they would seem "different".
Also note that the whole "two eyes, one head, two arms, and two legs" look is far from the only possible look. Even on Earth we have lifeforms that vary widely from this, like starfish. StuRat (talk) 00:51, 10 October 2015 (UTC)[reply]
It's also been noted that the space aliens imagined by earthlings are characterized by neoteny. They look like human babies, with big heads, big eyes, small bodies, lacking secondary sexual development, no body hair, etc. Space fetuses, if you will. - Nunh-huh01:13, 10 October 2015 (UTC)[reply]
Lack of nipples would mean they are not mammals, and, at least on Earth, sexual reproduction is much more widespread than mammals. StuRat (talk) 15:02, 10 October 2015 (UTC)[reply]
Well, yes. I'm not sure it's reasonable to apply earth taxonomy to space critters, but nonetheless UFO observers have no qualms about calling some ETs reptilian. The point is not what actual space aliens would look like, but what our fantasies of what they would look like are based on. And I think it's pretty clear our limited imagination is basing those fantasies on earth creatures, rather than the myriad of possibilities including asexual, sexual, and other as-yet-unanticipated forms of reproduction. - Nunh-huh17:12, 10 October 2015 (UTC)[reply]
Why unlike a good old brushed a motor which has only two wires a
+ and a - where I put two ends of battery cell and get the fair going, these 'brushless' ones have THREE wires. What am l going to do with the third one? And what [the hell http://imgur.com/9d15AvJ] is this. Kindly tell me about all this. I will be grateful. 27.255.210.207 (talk) 06:08, 10 October 2015 (UTC)[reply]
That image looks like the speed controller module for a radio-controlled copter. The three blue wires go to the brushless DC electric motor that drives a propeller; the thick red and black are power supply, and the black/red/white connector transfers signals (throttle, etc.) from a controller/receiver unit. The article I linked about the motor explains why there are three wires...it relates to the idea of the requirement for three-phase electric power in order to get a rotating magnetic field. DMacks (talk) 07:15, 10 October 2015 (UTC)[reply]
Get the data sheet of this product. If it is an battery false usage cause explosion of the battery. If it is motor controller or actuator, is might be an analog signal, to control the actor or motor speed. It also might be an digital input or output of sequencial protocol. Or pulse of motor speed of output as speedmeter or input as clock signal. --Hans Haase (有问题吗)12:12, 11 October 2015 (UTC)[reply]
I've built a few remote control choppers from components so I know a bit about these. As stated above, the battery should be plugged into the red and black wire (you should solder the appropriate male LiPo battery connector to the wires). The motor plugs into the blue wires, if your motor doesn't have 3 wires, it's not the right motor. You should use bullet connectors to connect the motor to the speed controller, you need to just plug all the wires in and then test if the motor is spinning the right way, if it isn't you just swap any two wires and it should be right. Vespine (talk) 21:54, 11 October 2015 (UTC)[reply]
Tetraethyl lead works as a buffer against microwelds forming between the hot exhaust valves and their seats.
I've read over the source a couple of times, but I didn't see anything there about microwelds. What are they? All I'm finding through Google are companies that promote their ability to use techniques to weld really tiny items; I don't see anything about microwelds that are somehow able to form without the presence of welders. Nyttend (talk) 11:20, 10 October 2015 (UTC)[reply]
No, that's still a deliberate process that uses heat to fuse the metal. The important point is that the microwelds are created by pressure, rather than heat; the valves are hot, of course, but they're well below the melting point of the metal. The galling is caused by the pressure of the valve on the valve seat during the ignition phase of the engine cycle. Tevildo (talk) 19:34, 11 October 2015 (UTC)[reply]
Do the all mammals (includes human body) have the same number of vertebrae?
See the Wikipedia article titled Vertebral column or this post. The tail is also part of the vertebral column, so mammals with tails have more vertebrae than those without. All mammals except sloths, anteaters, and manatees have exactly seven cervical (neck) vertebrae however. --Jayron3214:02, 10 October 2015 (UTC)[reply]
Two details: First, the Wikipedia article doesn't answer the question for mammals. Second, the medsci.org item does, but it actually contrasts long tails with "short or no tails", not with "without tails". Anyway, for one example of a different number of vertebrae see cat anatomy#skeleton. --174.88.134.156 (talk) 20:40, 10 October 2015 (UTC)[reply]
No. The egg white is extracellular material, as are the outer membranes and shell. The yolk on the other hand is part of the one-celled ovum, as both are surrounded by the same cytoplasmic membrane. see [7]. - Nunh-huh15:57, 10 October 2015 (UTC)[reply]
The egg as single cell is technically true, yet it should be taken with a grain of salt (some pepper too, ideally). The key concept is the notion of meroblastic cleavage, which is to say, when the egg is fertilized and begins dividing, the cells produced are initially content to divide themselves up on the surface without developing cell membranes separating themselves from the yolk beneath. Later, they do separate from the yolk, creating a subgerminal space. But what is clear throughout this process is that the yolk acts like it is a substance distinct from the cells, not really under the command and control of the sparse nuclei atop it. So don't imagine an egg as a giant cell with a heroic lone nucleus at the middle making all the decisions - it's actually only influencing a small region around itself at one edge. See [8][9] for some basic background.
As an example, consider fertilization in the chicken. Polyspermy is apparently allowed; when the yolk passes through the infundibulum of the oviduct and is exposed to sperm storage glands, the sperm preferentially seek out the near center (but not the exact center) of the germinal disc region [10] and break through the perivitelline membrane. They all even form sperm asters in the cytoplasm! [11] But only one of the sperm, of course, actually fathers the embryo - according to that last source, the other pronuclei are shunted away by some still-unknown means. So the egg really seems to act as if there is a small cell on one side waiting to be fertilized and all the rest is something else - even though there is no visible membrane to account for that. Wnt (talk) 06:36, 11 October 2015 (UTC)[reply]
Engineering and operations
If you have an engineering degree but rather than the infrastructure itself you're more interested in operating it (for example the management of road/rai/air/energy/oil supply etc operations), is there much point going down an engineering career path? — Preceding unsigned comment added by 90.201.186.84 (talk) 16:11, 10 October 2015 (UTC)[reply]
Pay to consult a proper careers adviser. He will ask a lot more probing questions than you can volunteer here. He may be able to suggest aptitude tests that can focus you on where your talents lay and a path to were you are most likely to succeed. You can't get that from a Wikipedia Reference desk question.--Aspro (talk) 20:02, 10 October 2015 (UTC)[reply]
yes, because engineering is a way into many other jobs. Knowing why stuff is designed the way it is will make you better at fixing operational problems with it. OTOH if your ambition is to be a pump jockey at a service station, then maybe petroleum engineering is the wrong career path. I wouldn't pay a careers adviser, in my experience they are useless.Greglocock (talk) 22:05, 10 October 2015 (UTC)[reply]
If you are talking about careers adviser that one finds in say British or US State schools -yes 'they' are useless. I'm talking about consulting a professional that will subject you to aptitude tests and the like. If one wants to know of the best way to invest ones inheritance do you ask your local bank manager – of course not. One seeks out an expert. So why not go to a professional for careers advice. Because over ones life time, that can make a difference of many hundreds of thousands of £ or $). Do the sums (working life in years X salary, plus company car, heath gym membership, pension rights, etc. and most of all, living enjoying satisfying and rewarding career). Don't be a skinflint. Jesus said that the poor will always be among us and then there is the Parable of the talents or minas. Take your choice. --Aspro (talk) 22:13, 11 October 2015 (UTC)[reply]
That was a good question! I was sure the answer would be no, but then I looked up quadruple bond and found this. So yes, all four sp3 orbitals in carbon can bond to a second carbon; the fourth bond is stronger than a hydrogen bond, though clearly not the preferred interaction. Wnt (talk) 06:42, 11 October 2015 (UTC)[reply]
You should try to make your question clearer. I think you are referring to the Sun's galactocentric orbit in the Milky Way? This is due to the combined gravity of the stars of the galaxy (in which the central black hole plays only a small part) plus a large component of dark matter whose nature is unknown. Wnt (talk) 06:48, 11 October 2015 (UTC)[reply]
All things considered, Gravity is actually a very weak force, it is by far the weakest of the fundamental forces. However, even though it is very weak, it can act over immense distances, in fact there is no limit to the distance it can act. So even though you can jump off the ground despite the gravity of the entire mass of the earth acting on you, if you were floating in space as far away as the moon, but NOT in an orbit around the earth, you would eventually fall to the earth. Vespine (talk) 23:07, 11 October 2015 (UTC)[reply]
Management postgraduate degrees
duplicate
The following discussion has been closed. Please do not modify it.
There's many management postgrad degrees whether business management, project management, operations management but are they worth it? If you can get a job in those areas without it, is experience valued more than a postgrad degree? Will it make any difference to long term progression in your career? 2A02:C7D:B91D:2200:6094:AAC9:8C83:4FDE (talk) 20:08, 11 October 2015 (UTC)[reply]
How much body weight could a person expect to lose when moving into an environment that is consistently 5C cooler than what he has been accustomed to given that he eats the same type and amount of food?--213.205.252.131 (talk) 21:46, 11 October 2015 (UTC)[reply]
I'll be surprised if there is a good answer to this question. Put on a jumper and there's no difference ;) We know people burn more calories in colder climates, but metabolism and rate of activity also changes, as does regular clothing. Secondly, the difference between 18c and 13c would have much more of an effect than the difference between 25c and 20c. Vespine (talk) 23:19, 11 October 2015 (UTC)[reply]
What kind of answer do you expect? A specific weight? like 5kg? 2kg? I don't believe anyone will be able to give you any kind of reasonable answer, even with the above refernced calculations. The MOST you could work out with the quite complicated calculations is how many more calories you will burn in the colder environment. That STILL doesn't come close to answering how much weight you would eventually lose. Theoretially if you burn more calories than you consume, you will eventually wither away and die, but the skinnier you get the less you burn, so if you reduce your calorie intake just a little eventually you probably hit a balance, but there are many factors here too, exercise, sleep, basal metabolic rate which will vary the result between individuals considerably. Also, "eating the same amount of the same food" is a lot easier said than done, unless you religiously monitor your calorie intake, eating a few hundred calories a day is extremely easy to do even inadvertently. Vespine (talk) 02:34, 12 October 2015 (UTC)[reply]
October 12
Eye independence in vertebrates
I have recently read that dolphins can aim their eyes at separate objects, and have long known that chameleons can do so. Is it known what the primitive state of this ability in early chordates was? Could sharks, bony fish, or more primitive fish focus on two separate objects at the same time? Thanks. μηδείς (talk) 00:54, 12 October 2015 (UTC)[reply]
What about most herbivores? A horse (for example) has 350 degree vision - with only 65 degrees of binocular vision. So it can clearly rotate one eye to an angle that the other eye cannot match. Are they then 'switching off' the other eye to get a simple monocular image - or are they getting two completely unrelated images simultaneously? SteveBaker (talk) 03:16, 12 October 2015 (UTC)[reply]
taking information regarding training procedure in food processing and quality control department
sir i am pursuing msc in food technology and i want to pusue training in quality control and food processing department so what steps should i adopt in order to apply for training in your industry
