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John_Maxwell_IV comments on Minor, perspective changing facts - Less Wrong
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Not so sure about that, just dive a few meters under water, and the pressure gets up very quickly, roughly, every 10m you dive, you get an additional atmosphere of pressure, and people are known to be able to dive below 100m with training but without special apparatus. The problems arise mostly when the pressure changes quickly (or when it gets very high), but a pressure of 10 atmosphere, with sufficient preparation and adjusting time, doesn't kill a human being.
I don't see how this squares with Silas' claim that a 15-lb dumbbell hurts your hand when you rest it on it.
OK, I just tested this by balancing the end of a ~21 pound dumbbell on my palm while my palm rested on a counter (surface area of dumbbell end looks to be about 0.60 square inches, making the pressure around 35 psi, or about 2.3 atmospheres?) It was a little painful, but I didn't cry out or feel the need to get the thing off immediately. So in conclusion, I think Silas might have been exaggerating.
Resting my palm on a pillow instead of a counter, I don't really experience pain anymore, just discomfort. Maybe that has something to do with the fact that deep diving doesn't cause pain?
People's pain tolerances vary a lot.