I figure we don't have it, because basically we haven't had the need for it. 100'000 years ago when we were running around in Africa, we were exposed to the sun - all the time. That means we had a pretty good base to withstand the rays of the sun. Besides, we probably covered ourselves in mud (like the elephants), or stayed in the shades during the most intensive hours of the day.

Nowadays, most of us are sitting inside when the sun is up, and we don't gradually build up this tolerance. And then when we have 2 weeks off, we're suddenly laying flat out on some beach somewhere, totally exposed to the sun the entire day. No wonder our skin gets damaged.

Rather then waiting for something to fix skin damage, learn how to avoid damaging your skin in the first place instead.

I try to work 4 hours one or both days of the weekend when i have the chance. This way i can earn up some hours without, as mentioned, contributing negative to our project. I'll have a stress-free morning, usually a workout and then it's off to work. (Ok, and maybe some drumming on "Guitar Hero: Metallica" if i feel like it..) When i go home i'll still have energy and plenty of hours to relax and do whatever i want.

And, it's remarkable how much i get done when i'm left alone to concentrate and focus, without people distracting me.

They seem to have forgotten about the metagamers :)

Given that antioxidants neutralize free radicals, here's a test one could do to see if free radicals really are involved.

Take two groups of people. Group #1 are people who's on the paleolithic diet (stone age diet), with very high intakes of antioxidants and thus a low level of free radicals. And group #2 are on the fast food diet or something that's really low in antioxidants and thus have a high consentration of free radicals in their bodies.

I would expect to see more light from group #2.

Not necessarily, the first self-driving car to follow a ordinary car could do this at a safe distance, and self-driving cars following this one would just follow in a normal self-driving kind of way (1 meter behind or whatever). The lead self-driving car would then smooth out any errors made by the ordinary car, and overall make for a smoother ride for all. Then you would have eliminated at least a bunch of drivers and all their errors.