VIDEO Learn how Roman engineers kept water flowing for miles around the expansive metropolis. World First Water Supply | For more Strip the City, visit http://science.discovery.com/tv-shows...
People spend a third of life asleep. Every organism on Earth—from rats to dolphins to fruit flies to microorganisms—relies on sleep for its survival, yet science is still wrestling with a fundamental question: Why does sleep exist? During Shakespeare and Cervantes' time, sleep was likened to death, with body...
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