I suppose if you go back to the days when men rose in the mornings and went out into the jungle or on to the plains to hunt for food, losing hair was a real problem. Just imagine the bright sun shining off the bald head. This beacon of light would frighten the game animals away faster than you could move downwind. It would be worse than dropping your spear or forgetting to bring your cudgel along, where the other members of the hunt could cover for you. But when your presence drives the potential food away. Now that's a real problem. So they drive you out of the cave - no freeloaders allowed. You do your best to join the women in the gathering part of the survival exercise. Berries and roots are not disturbed by your lack of hair. In the end, you probably starve to death and this serves as a terrible warning to the other members of the tribe. Some of the men experiment with animal skins, hoping to invent baseball caps. Others try rubbing earth or other substances on to their scalps. At the very least, it all cuts down the glare factor.

It's no different today. Were it not for the development of other skills which can be sold in exchange for food, all balding men would starve. This just leaves the other reaction. Women often see balding men as undesirable for breeding purposes. Who wants to have children with someone who may pass on the balding gene? It's much kinder to let natural selection end these poor creatures and leave the human race stronger and more hairy as a result.

So men who see the first signs of premature male pattern balding slowly emerge must take action to preserve their credibility for breeding purposes. Other problems can be cured. Dental work can correct less than perfect teeth. Cosmetic surgery can remove excess fat and smooth away early wrinkles that might betray age. Style gurus can advise on clothes to wear. This just leaves the hair. Fortunately, the researchers had one of those lucky accidents. There's this wonderful myth that scientists set out with a hypothesis, devise experiments and prove themselves brilliant. Ironically, there's just as much discovered when experiments go hopelessly wrong. Bright-eyed and not defeated, they try to find the reason for their humiliation.

So it was with those scientists trying to find a way of treating prostate cancer. Imagine their surprise when the drug trials suddenly produced more hair on the heads of many participating men. After recovering from their Simpson "doh" moment, they realized they might have a money-spinner on their hands. Several trials later, the FDA was convinced and a license was issued. Propecia could be released on to world markets as the only drug to have been fully tested and approved by government regulators. It's a great marketing strategy when you can tell the truth about your product. Too often in the past, marketers had to lie and cheat their customers, moving on to the next town quickly before the scam was discovered. This time, they really could say Propecia stops hair loss and hold their own heads up proudly.