$50 to anyone who can prove to me Evolution is a lie.

AiG take a great many words to tell a very simple story.Their presupposition is "We know the conclusion, so we must interpret evidence in ways that support it."The natural consequence of this is of course that evidence that can't be so interpretted (e.g. retro-viral insertions, the human/ape chromosomal fusion event, etc. etc.) don't get a look in.Telling also is the misrepresentation of the evidence that sometimes has to take place to support creationism - anyone remember Kent Hovind and his sunflower Cytochrome C?You can't call that science by any stretch of the imagination.

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So if something cant be proved to be false, it cant be a valid 'scientific' hypothesis ?

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Correct. Falsifiability is one of the criteria of a scientific hypothesis. There is no way to test it otherwise.

Indeed, there are many species which can interbreed and form perfectly viable offspring. Ask anyone who keeps and breeds tropical fish - the common Swordtail (Xiphophorus helleri) and its relative the Platy (Xiphophorus maculatus) are completely interfertile, and few aquarium specimens have pure blood. The black and silver mollies are hybrids of Poecilia sphenops, P. latipinna and P. velifera. In the wild, reproductive isolation is maintained by these species having different niches or by geographical seperation, but in captivity they interbreed freely.It's actually a problem. There are hundreds of endemic species of Cichlid fish in lake Malawi, but since the lake is young (geologically speaking) many of these species are very closely related (isolated in the wild again by niche and distribution) and interbreed freely in aquaria. Unfortunately, like when you mix different colours of plasticene....