Wikipedia:Main Page history/2018 January 8
From today's featured articleThe periodic table is a chart of the chemical elements, ordered by their atomic number and electron configurations. The elements in each group (column) often have similar chemical properties. The table also shows four rectangular blocks with some similarities in physical and chemical properties. Six groups have generally accepted names, including the halogens of group 17 and the noble gases of group 18. The table provides a framework for analyzing chemical behaviour, and is extensively used in chemistry and other sciences. The Russian chemist Dmitri Mendeleev published the first widely recognized periodic table in 1869, and correctly predicted some properties of then-unknown elements that would be expected to fill in the gaps. Mendeleev's periodic table has been expanded and refined over time; elements 1–94 have all been found to occur naturally, and elements 95–118 have been synthesized in nuclear reactors or laboratories. (Full article...) Did you know...
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In the news
On this day...January 8: Coming of Age Day in Japan (2018)
Athelm (d. 926) · Fanny Bullock Workman (b. 1859) · Bronislava Nijinska (b. 1891) |
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The Robot Hall of Fame is an American hall of fame that recognizes notable robots in various scientific fields and general society, as well as achievements in robotics technology. The organization was established in 2003 by the School of Computer Science at Carnegie Mellon University in Pittsburgh, Pennsylvania, as an acknowledgement of Pittsburgh's achievements in the field of robotics and with the aim of creating a broader awareness of the contributions of robotics in society. The idea for the Robot Hall of Fame was conceived by Carnegie Mellon School of Computer Science dean James H. Morris, who described it as a means of "honor[ing] robots that have served an actual or potentially useful function and demonstrated real skill, along with robots that entertain and those that have achieved worldwide fame in the context of fiction." The first induction ceremony was held at the Carnegie Science Center on November 10, 2003. Thirty robots – both real and fictional – have been inducted into the Robot Hall of Fame since its inception. (Full list...)
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Jaffa Clock Tower is a clock tower on Yefet Street at the northern entrance of Jaffa, an ancient city now part of Tel Aviv. The tower, which was constructed by the Ottoman Empire between 1900 and 1903, is made of limestone. It incorporates two clocks, as well as a plaque commemorating the Israelis killed in the battle for the town in the 1948 Arab–Israeli War. Photograph: Andrew Shiva
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