@howitactuallyworkhiaw: How helmets work is simple physics. 3mm of foam absorbs 500lbs of force by crushing. The shell spreads impact while cells collapse to extend deceleration, lowering the force on your skull. The helmet fails so your brain stays safe. Why do we need to replace them after a crash? #bikehelmets #safetytips #physics #cycling

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Thursday 02 July 2026 12:51:57 GMT