It’s not true that most drugs intended to cure male pattern baldness are ineffectual. Tests with pigs, whose skin is much the same as ours, turns them into small bears with hooves. It’s been hard for scientists to restrict hair growth to only scalps. Topical applications have a similar problem. Tests have shown that men who apply miracle hair-growth lotions don’t want to use rubber gloves. (It’s not manly, they say.”) And what man wants hair growing between his fingers and on his palms?