An anonymous reader writes "It seems like every week there's a new story about the consequences of all those concussions experienced by football players and other athletes — just a few days ago, the NY Times reported that some athletes diagnosed with Lou Gehrig's Disease may actually have a neural disease brought on by head trauma. But missing in these stories is an explanation of what head trauma actually does to the brain cells. Now Carl Zimmer has filled in the gap with a column that takes a look at how neurons respond to stress, and explains how stretching a neuron's axon turns its internal structure into 'mush.'"
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