Concussions still Carson's concern

Updated: February 7, 2010, 9:01 AM ET
By Greg Garber | ESPN.com

Even when he was careening around the field as one of the hardest-hitting linebackers in the game, his head seemed enormous.

Today, at 56 years old, he's 8 pounds over his playing weight of 237 pounds, a little softer around the edges. But on so many levels, that noble cranium and its contents still define Harold Donald Carson.

The human brain weighs about 3 pounds and is three-quarters water. And yet there are more than 15 billion neurons, each one linked to some 10,000 ...

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