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Zach Thomas will donate his brain to science some day. For now, he's willing to share the thoughts rattling around inside it. The all-decade inside linebacker for the Miami Dolphins was a guest on Miami sports-radio station WQAM and tackled severa...

Stephen Dunn/Getty Images Former Dolphins linebacker Zach Thomas is one of a growing number of NFL players vowing to donate their brains to research. At least 20 times, the memory came crashing back for Don Hasselbeck. In a flash, he was a teena...