Kids and Concussions, the gene for our big brain, island hopping into the Americas and animals are loud, humans are quiet

Quirks and Quarks

Kids and concussions - the latest science on risks and long term effects; A gene for our big brains was rescued from the DNA garbage bin; The first Americans 'island hopped' down the west coast past the glaciers; Animals vocalize 100 times louder than humans - it's a matter of survival

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