Podcast: Brain Shrinkage, Black Hole Collisions, and Electro-Sensing Dolphins

David Grimm
Stewart Wills
2011-07-29 12:41

Why does the human brain shrink with age? Can dolphins sense electricity? And did the Milky Way's black hole collide with another black hole just a few million years ago? Science's Online News Editor David Grimm chats about these stories and more with Science's Kerry Klein.

(Listen to the full Science podcast and more podcasts.)

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