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Science  03 Feb 2012:
Vol. 335, Issue 6068, pp. 508-511
DOI: 10.1126/science.335.6068.508-c

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Thomas Edison is still number one when it comes to invention. Researchers think they know why the male orb-web spider will often voluntarily break off his whole sex organ while it's still lodged in the female's abdomen: It continues to transfer sperm into the female long after the male has fled or been consumed. A British seismologist has a geologic twist on the classic nightstand "word-a-day" calendar: the daily rock. And this week's numbers quantify the price offered for DNA sequencing company Illumina and the percentage of plant collectors who have found more than 50% of the world's known species.