How To: Wash your hair scientifically (and perfectly)

Wash your hair scientifically (and perfectly)

It's no joke: British researchers spent six months shampooing 500 volunteers until they perfected the precise technique for lustrous locks. Learn how to wash your hair perfectly. You will need a shower, a thermometer, shampoo, measuring spoons, a stopwatch, conditioner, a wide toothed comb, and a towel.

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