Slip, slop, slap (whitey) - don't turn black!

I remember an ex-girlfriend from Zimbabwe who showed me the 'sunburn' on her black skin.
I remember working with some Botswanans on a night shift and they said they love working with me, because I glow in the dark.
Jokes aside. Black skin (Tests in Ultraviolet chambers) can take up to x7 more UV than whiter, fairer, paler and lighter skin tones.
The down side of Black skin is that in polar regions where there is less sunlight intensity, etc - the skin becomes 'blotchy' (white spot) and they suffer the effects of lack of Vitamin D more than other less darker skin types which can come across like depressive lethargy.
There's an advantage/disadvantage to all skin types I guess.
The Cheer Mob worked up their nice Black skins over thousands of years and generational adaption to the environment. Whities who go and sausage-sizzle themselves on Bondi Beach, etc in the hope of turning way darker in such short 'intense' time periods really do put themselves at risk considerably.
...then there's the 'thickening' (or hardening) of skin for those who swim a lot in cold waters. But I guess that's another story?