' Hair, hair, hair: I've got none on my noddle
... I'm proud of my old bald head ' sang Harry Champion, but the loss of hair doesn't give most men cause to rejoice. Although doctors know why baldness occurs, they've been unsuccessful in correcting it.
Geoff Watts talks to a dermatologist and a biologist about the causes of baldness, and to an American medical researcher who believes he has discovered a drug that may restore hair growth.
Producer DEBORAH COHEN