re: Humans may not be from earth- an ecologist defends his controversial claim

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10. Bad Backs

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If we evolved on this planet, why does just standing up on it hurt us?

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I stopped here. Humans have bad backs because we evolved on all fours...this is easily seen in our skeletons as it's set up to have intestines hang freely. Think great apes walking on all fours. Standing upright is, relatively speaking, a new thing for us and we've accomplished it faster than our bodies have been able to cope with the change.

I'm not opposed to the idea of panspermia, just that if this is one of the reasons given he's on shaky ground to start with.