10 Reasons Why Humans May Not Have Come From Earth

Right, so what's the deal with this bipedal thing? How come everything else on the planet has remained perfectly happy with a low centre of gravity and sturdy base, whereas we wobble around on two legs?

Perhaps it's just because we're looking at it from the inside, but you have to admit that we tend to stick out a bit. Two legs, extremely fine coat, hair growing out of odd places, opposable thumbs, huge heads, big, flat feet - we look much more like aliens than natives.

Silver points to our lack pf body hair as a particularly odd feature of humans. It is necessary for humans to wrap themselves in the furs of other animals, just to stop ourselves freezing to death, even on the hot African plains where we are supposed to have evolved. 

The theory is that perhaps on our home planet, the temperature didn't fluctuate so much between night and day and at different latitudes. Possible reasons for this could be a thicker cloud layer that insulates the planet (a bit like on Venus), a binary star system (so that the sun effectively never sets), or even that the crust of the planet is much thinner, allowing the heat from the molten core to come up through the ground.

As a weird side note: Our relatively high levels of subcutaneous fat and almost total hairlessness, as well as our bipedalism, would actually make us excellent swimmers. Maybe we were some kind of race of semi-aquatic dolphin people on our home planet.