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New Theories / Fair Hair?
« on: 23/11/2010 20:36:26 »
Ever noticed the gradual darkening of children's hair through to adulthood? - I've a theory;- The surface area to volume ratio of a body decreases with size. Therefore, a small body will lose heat much quicker than a large one. This was obviously a huge problem for our ancestors, to those who perhaps migrated to northern Europe from Africa.
Infant mortality must've been horrendous, but eventually via evolutionary adaptation, thinner lips, fine blonde hair (and the like) appeared. I propose;- children are fairest when they are young, is a simple consequence for the need to conserve body heat when it is most critical, as light hair 'reflects' heat back to the head far better than dark hair - as their bodies grew, this insulative measure was required to a lesser and lesser degree; hence, the mirrored evolutionary response. [:I]
ps;- even polar-bear cubs are whiter than their parents.
pps;- Eskimo's are dark skinned 'cause they've no fur, and need to screen ice reflected ultra-violet radiation by means of pigmentation - thus another adaptation has occurred with these people ..... monumental magnitude body fat. [:I]
Infant mortality must've been horrendous, but eventually via evolutionary adaptation, thinner lips, fine blonde hair (and the like) appeared. I propose;- children are fairest when they are young, is a simple consequence for the need to conserve body heat when it is most critical, as light hair 'reflects' heat back to the head far better than dark hair - as their bodies grew, this insulative measure was required to a lesser and lesser degree; hence, the mirrored evolutionary response. [:I]
ps;- even polar-bear cubs are whiter than their parents.
pps;- Eskimo's are dark skinned 'cause they've no fur, and need to screen ice reflected ultra-violet radiation by means of pigmentation - thus another adaptation has occurred with these people ..... monumental magnitude body fat. [:I]