what's your fave theory which tries to explain the bipedalism among hoomans, anons? mine is;

>aquatic ape theory
this theory doesn't only explain the bipedalism but also the nakedness, the articulated speech and accumulation of fat in a thick sub-cutaneous layer.

>In water, walking on two legs incurs no more danger of tripping over and crashing to the ground than walking on four. There is no distension of the veins because immersion prevents the blood from pooling in the lower limbs.

>The really indispensable pre-adaptation for speech is the enhanced degree of conscious breath control which we share with all diving mammals and no purely terrestrial ones. The pattern of inhaling deeply and quickly, and exhaling slowly at a controlled rate, is characteristic of aquatic mammals when they dive – and of humans when they speak.

>Only two kinds of environment are known to be conducive to nakedness in mammals – a totally subterranean one, like that of the naked Somalian mole-rat, and an aquatic one. No one suggests that our ancestors ever lived in a hundred per cent subterranean habitat.

>The compensations on land are indeed obscure, but for aquatic mammals at least two possible advantages of the fat layer can be readily detected – insulation and buoyancy.
The subcutaneous fat layer, while in air it provides less efficient insulation than a coat of fur, is extremely efficient as a protection against heat loss in water

>suggested reading;
The Scars of Evolution, E. Morgan
The Aquatic Ape Hypothesis, E. Morgan