A brick weight is about 3 or 4 pounds I'd guess. Now when they are out in their kayak the chances of having a brick in hand are from what-are-you-kidding-me to not-a-chance-in-hell. However they could have something about that weight they really really don't want to lose. To make the contest uniform they use a brick, then if they drop it in a choice between brick and air it's not a big deal.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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