Gravity

No, not the film, though it is rather good, regardless of the fact it was post-processed for 3D; where best to watch it.

Many of our biological mechanisms use it. Gravity. And (here's the kicker) why men lose hair on the top of their head1.

This isn't known science (so no credit here, not going to write a white paper - feel free. Many have.), but that's why it is.

The hair on the back of your head, all the way up (to where it curves over to "top") is subject to constant gravity. Gravity pulling on it. The pulling is what matters.

The obvious solution is to systematically, for even a minute-per-day, pull the fuck out of those top hairs, handfuls, in chunks. Work all the way around what will otherwise become your bald patch; like an X-Y grid.

Make it sore. No pain No Gain, etc.. Pain is weakness leaving the body, and so on.

Now you don't get a bald spot.

No need for thanks. Just, en-joy!

;o)