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.
expiredpublic1414995219004cove1414 Full Episodeunavailabledisabledshowfalse14205Roving Gang of Sea Snakes and Fish Terrorize Reef Sea snakes and reef fish help each other snag an easy meal. 2016-05-11 20:00:00http://www.pbs.org/wnet/nature/files/2016/04/seasnakes_fish-480x270.jpg2365732908cove14200How Do Hippos Get Clean?Hippos get scrubbed from head to toe by a fish called the barbell. 2016-05-11 20:00:00http://www.pbs.org/wnet/nature/files/2016/04/hippo_clip_thumb-480x270.jpg2365732890cove