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HIV, the virus that causes AIDS, has killed close to 30 million people since the epidemic emerged in the early 1980s. Scientific American editor Christine Gorman explains why HIV is so difficult for the body to fight and for doctors to treat.
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Myrmecos Bizarre. It's a desert Cataglyphis with jaws like an Eciton army ant: http://t.co/0aXQSE8EPG #convergence
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