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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.
Why Barns Are Red - The Countdown #22
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Tapping Into Thin Air
The First Flight of the Robobee
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Gemini's Paraglider Landing System
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JenLucPiquant Whimsical, animal-filled illustrations of mathematical concepts: Kasia Jackowska's Drawing Mathematics series http://t.co/WTLEJYlMQz
cassierodenberg "please believe drugs kill! wish you were here" -- train beneath the Bruckner, Hunts Point http://t.co/gL5XQroJHB JenLucPiquant No Matter How Many Times You Explain Something -- pre-exsting misconceptions hamper science communication http://t.co/Q5NdVfCgPw
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