Radio 4 in Four - How does hair know how long to grow? - ÃÛÑ¿´«Ã½ Sounds

Radio 4 in Four - How does hair know how long to grow? - ÃÛÑ¿´«Ã½ Sounds


How does hair know how long to grow?

Explore why the hairs on your legs don't grow as long as the hairs on your head.

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