10 Reasons Why Humans May Not Have Come From Earth

Okay, it should be said at this point that Dr. Silver's theories should be taken with a healthy pinch of salty skepticism. 

The idea of planet seeding is one that is gaining lots of interest in the scientific community and many have expressed interest in investigating Silver's thoughts more thoroughly. Of course, there have also been those who have said that “it is possible to drive a coach and horses through several of his arguments.” 

Which is also a fair point.

Silver often mistakes cause for effect and relies too heavily on the assumption that evolution is a perfect process. The idea that every mutation has to "make sense" completely is false, and the idea that evolution does not compromise is wrong. If the benefits of a particular mutation outweigh the cost, then it's likely to stick around, warts and all. 

For example, this accounts for the idea that childbirth is very difficult. In fact, it is because we essentially walk on our hind legs that our pelvises have changed shape. Luckily, the benefits of walking on two legs, thereby freeing up your hands for things like tool-making, outweigh the drawbacks of difficult and painful births (we can even use our hands to help each other give birth). This is known as the Obstetric Dilemma.

Whilst this doesn't Silver's theory, it does slightly weaken the "Childbirth, what's that all about, eh? Eh?!" angle. Something that Dr Sliver relies on quite a bit.

There are quite a few holes like this in Dr. Silver's theory. But, then again, Silver himself has said that his arguments are designed to spark open debate, and are by no means conclusive proof that we're all aliens.

So, with that in mind, let us know what you think in the comments. Are we a bunch of hyper-evolved aliens, trapped on this godforsaken rock, or are we just a bunch of apes in shoes after all?