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12.20.11 9:45 AM ET

Science Breakthroughs in 2011: Cancer Vaccines, 3-D Printing, and More

In matters mathematical, vegetable, and mineral, 2011 was a big year for science, which discovered, among other things, a planet much like earth (but far, far away), a smaller battery for electric cars, neutrinos faster than the speed of light, cancer vaccines, and a computer that wins at Jeopardy.