Saw-scaled vipers may be small, but they pack a nasty venomous punch. This one, Echis carinatus sochureki, was used in a study on snake venom. Courtesy of Wolfgang Wüster hide caption

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Courtesy of Wolfgang Wüster

Daily medications for young children with HIV include both tablets and liquid drugs in syringes. Andrew Aitchison/In Pictures/Corbis hide caption

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Andrew Aitchison/In Pictures/Corbis

Scientists Report First Cure Of HIV In A Child, Say It's A Game-Changer

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