One day in 1976, psychiatrist Philip May asked his colleague at the University of California, Los Angeles a peculiar question: 'Why don't woodpeckers have headaches?' May specialized in treating schizophrenia, but proposed a radical shift: How, he wanted to know, might an animal that repeatedly slams its head into a tree trunk at 16mph keep from getting brain damage?
So, why don't woodpeckers get brain damage?
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