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1. Raindrops aren't "teardrop shaped," they're roughly spherical.
2. Raindrops fall slowly due to the "square/cube rule": as you scale up a design (like a raindrop) the force of gravity goes up by the cube, but drag is roughly proportionate to frontal area, and goes up by the square (ignoring Reynold's number.) A teardrop probably falls faster than a teardrop-sized person would.
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