00:00If you lay down on a bed of nails, your body weight is spread across thousands of points,
00:06and this means the pressure on each nail is too low to break the skin.
00:11But if one nail sticks up just a bit higher than the rest,
00:15then all that weight gets focused onto a single point.
00:19This would be strong enough to puncture your skin,
00:22which is why they need to be perfectly level.
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