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EVOLUTION. For the article ‘‘Recombination within natural populations of pathogenic bacteria: Short-term empirical estimates and long-term phylogenetic consequences’’ by Edward J. Feil, Edward C. Holmes, Debra E. Bessen, Man-Suen Chan, Nicholas P. J. Day, Mark C. Enright, Richard Goldstein, Derek W. Hood, Awdhesh Kalia, Catrin E. Moore, Jiaji Zhou, and Brian G. Spratt, which appeared in number ...
I f the periodic table is an atlas for chemistry, then the actinides should surely be labeled “Here be dragons”. All are radioactive, only thorium and uranium are found in appreciable quantities, and most of the rest are produced by the sort of modern-day alchemy that relies on nuclear reactors or particle accelerators. Stosh Kozimor, a staff scientist at Los Alamos National Laboratory, is one ...
A prior study showed that middle school students who used the educational game Decimal Point achieved significantly higher gain scores on immediate and delayed posttests of decimal understanding than students who learned with a more conventional computer-based learning tool. This paper reports on new analyses of the data from that study, providing new insights into the benefits of the game. Fir...
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