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They've gone and done it, those crafty scientists: As reported by Nature (as in the publication), a team of Japanese researchers has successfully cultivated "fully developed sperm" from "immature mouse testicles." And they're not just showing off.

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It's been more than two decades since the birth of Louise Brown, the world's first "test-tube baby," and now one of the pioneers who helped make in vitro fertilization (and, by extension, Brown herself) a reality has been tapped to receive the Nobel Prize in physiology or medicine.

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