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IBM's Jeopardy-playing machine can now beat human contestants The computer has an advantage when it comes to ringing in on questions. Anyone who's seen Jeopardy knows that human contestants can struggle with timing when buzzing in after questions. Watson has great reaction speed. But the Watson development team faces many challenges in creating a robotic Jeopardy champion. Without being connected to the Internet, the computer has to understand natural language, determine the answer to a question (or, in the case of Jeopardy, the question to an answer), and then calculate the odds that its answer is correct in order to decide whether it is worth buzzing in. The games are played at IBM's "Watson Research Center" in Yorktown Heights, N.Y., with a real stage and professional host -- though not Alex Trebek. http://www.networkworld.com/news/2010/021010-ibm-jeopardy-game.html

Periodic Table of Elements and Chemistry http://www.chemicool.com/ We call the vertical rows groups . For example, here is Group 2: Today the chemical elements are still arranged in order of increasing atomic number (Z) as we look from left to right across the periodic table. We call the horizontal rows periods . For example, here is Period 4: We also now know that an element's chemistry is determined by the way its electrons are arranged - its electron configuration .

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