Biggest Scientific Breakthroughs Of 2014

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This year, humanity landed on its first comet, a child was born to a woman with a transplanted womb, and a fossilized sea shell forced us to reconsider our conceptions of human culture. Those are just a taste of the 20 achievements, innovations, and advances we've selected for our roundup of 2014's biggest… » 12/19/14 5:11pm Friday 5:11pm