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Bicycle helmets crush once to absorb deadly impacts

HERE’S THE INTERESTING PART

They are literally built to destroy themselves. The dense foam inside isn't meant to be bouncy; it is designed to catastrophically crush inward during a crash, slowing down the violent deceleration of your skull by a few vital milliseconds. Once it does its job, it is completely useless.

Bicycle helmets crush once to absorb deadly impacts
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