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Work done to isolate drugs from Streptomyces bacteria (left) and sweet wormwood (right) that treat parasitic diseases earned the 2015 Nobel Prize in physiology or medicine.

fizzy chemical

BUBBLE POWER  A fizzing chemical leaves a jet of bubbles in its wake as it races through a liquid. Such bubbles could propel drugs into wounds to stop blood loss. 

sperm and egg

Blocking a newly identified protein in sperm tails stops sperm from penetrating eggs, and could be the key for developing male contraceptives.

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