About 8,000 years ago, the relationship between cows and man began with the revolutionary advent of domestication in Mesopotamia, the Indus River Valley, and Africa. Discover how cows have altered human life, human biology, and the geography of the world.
expired1414995219004cove1414 Full Episodeunavailabledisabledshowfalse12891Big Birds Can't Fly Sir David Attenborough explains how some birds thrive despite their inability to fly. 2015-10-07 20:00:00http://www.pbs.org/wnet/nature/files/2015/09/01_09_18MB1-e1443803136110-480x270.jpg2365578436cove12899Cheetahs Chase Down OstrichOstriches are fast, but cheetahs are faster. 2015-10-07 00:00:00http://www.pbs.org/wnet/nature/files/2015/09/01_12_43MBr1-e1442947566712-480x270.jpg2365561652cove
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