It feels like Nye was pitted against an absolute straw man, but you got to start somewhere right? Proving that young earth theories are absurd is... absurdly easy. I mean, Nye doesn't even begin to touch on the body of evidence here.
And as expected, Ken Ham's argument against evolution is the typical "intelligent design" way of looking at coherent and predictive scientific work and basically saying "But it happened in the past, you have no way to prove anything about the past". Which would of course require extremely unlikely unfalsifiable and unpredictive alternative explanations. It's quite a remarkable defense from a biblical literalist though. It just comes down to the essence of faith : I can believe in the existence of an undetectable teapot behind the Moon and you can't prove it's not there because the teapot is not detectable. To state that the world was created 6000 years ago is just the same thing but more elaborate and more difficult to justify.
I mean it's a defense that is technically true because you don't have accounts of the past, but if you take that defense as valid to dismiss all the body of scientific work that talks about the past, then you might as well dismiss everything in science because there are equally convincing theories to doubt about "obvervational science". This world view makes as much sense as saying "everything is an illusion", and the correct response to that is that it doesn't matter, science is defined by what works. This debate was pretty pointless, because it all comes down to discussing the nature of unfalsifiable theories and Ken Ham playing devil's advocate with the evidence.
Also Ken Ham obviously doesn't understand the nature of mathematical truths (such as the laws of logic he keeps on referring to). Mathematical truths would be true even if no physical world existed, and apparently to him without God it would be impossible to have logic.
I have a question for the non-believers among you:
If god is unreal, what about quake and half-life?
Well I personally own Unreal (the very first one) and I think it is the best single player FPS I ever played. That including good modern FPS like Metro.