2011
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Events
Earth's population reaches seven billion.
- January 24 - Scientists and students build a 3D printer that makes edible food. (Link)
- March 12 - Surgeons successfully implant the world's first continuous-flow artificial heart in a human patient.
- August 16 - Private donors raise enough money to re-open the mothballed SETI radio telescope array, allowing for the continued search for extraterrestrial intelligence.
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