Posto questo articolo sulle conseguenze dell'evoluzione perché credo, come forse altri in questa sezione, che la calvizie rientra fra gli effetti collaterali della stessa (per me dovuta alla repentina crescita della scatola cranica e all'assunzione della postura eretta)
Al punto 6 (We're awfully cold in winter), viene riportata una possibile causa socio-evolutiva della perdita di capelli:
Fur is a warm hug on a cold day, useful and nearly ubiquitous among mammals. But we and a few other species, such as naked mole rats, lost it when we lived in tropical environments. Debate remains as to why this happened, but the most plausible explanation is that when modern humans began to live in larger groups, our hair filled with more and more ticks and lice. Individuals with less hair were perhaps less likely to get parasite-borne diseases. Being hairless in Africa was not so bad, but once we moved into Arctic lands, it had real drawbacks. Evolution has no foresight, no sense of where its work will go.
Per chi si interessa di calvizie correlata ai difetti di spessore dentale, segnalo il punto 8 (Our brains squeeze our teeth):
A genetic mutation in our recent ancestors caused their descendants to have roomy skulls that accommodated larger brains. This may seem like pure success—brilliance, or its antecedent anyway. But the gene that made way for a larger brain did so by diverting bone away from our jaws, which caused them to become thinner and smaller. With smaller jaws, we could not eat tough food as easily as our thicker-jawed ancestors, but we could think our way out of that problem with the use of fire and stone tools. Yet because our teeth are roughly the same size as they have long been, our shrinking jaws don’t leave enough room for them in our mouths. Our wisdom teeth need to be pulled because our brains are too big.
buona lettura
http://www.smithsonianmag.com/science-nature/The-Top-Ten-Daily-Consequences-of-Having-Evolved.html?c=y&page=1
Al punto 6 (We're awfully cold in winter), viene riportata una possibile causa socio-evolutiva della perdita di capelli:
Fur is a warm hug on a cold day, useful and nearly ubiquitous among mammals. But we and a few other species, such as naked mole rats, lost it when we lived in tropical environments. Debate remains as to why this happened, but the most plausible explanation is that when modern humans began to live in larger groups, our hair filled with more and more ticks and lice. Individuals with less hair were perhaps less likely to get parasite-borne diseases. Being hairless in Africa was not so bad, but once we moved into Arctic lands, it had real drawbacks. Evolution has no foresight, no sense of where its work will go.
Per chi si interessa di calvizie correlata ai difetti di spessore dentale, segnalo il punto 8 (Our brains squeeze our teeth):
A genetic mutation in our recent ancestors caused their descendants to have roomy skulls that accommodated larger brains. This may seem like pure success—brilliance, or its antecedent anyway. But the gene that made way for a larger brain did so by diverting bone away from our jaws, which caused them to become thinner and smaller. With smaller jaws, we could not eat tough food as easily as our thicker-jawed ancestors, but we could think our way out of that problem with the use of fire and stone tools. Yet because our teeth are roughly the same size as they have long been, our shrinking jaws don’t leave enough room for them in our mouths. Our wisdom teeth need to be pulled because our brains are too big.
buona lettura
http://www.smithsonianmag.com/science-nature/The-Top-Ten-Daily-Consequences-of-Having-Evolved.html?c=y&page=1
