i don't know why everybody is going crazy over this... It's an alien liquid, so it can be made up of anything of the imagination. You can say this doesn't apply to science, but only doesn't apply to science of this world. Not another. Can you really say that all the elements in the universe exist on Earth? Of course not. In Predator 2, the spear was made up of elements not of this world. So, in theory, the liquid could be made up of something so different and advanced, it could make aliens dissolve into water or whatever.... That's why Science fiction is so great. Everything can be explained by it being alien.