>Well, in this case, science has proven it. Therefore, it's a fact.


It could be argued that you're thinking of light water, as opposed to heavy water (H3O) such as that employed in reactors.

Both of which can be argued to be water, which means your initial indisputable fact is found in valid dispute.

I note the quote in AlexF's signature:


"In science, 'fact' can only mean 'confirmed to such a degree that it would be perverse to withhold provisional assent.' I suppose that apples might start to rise tomorrow, but the possibility does not merit equal time in physics classrooms." -- Stephen Jay Gould


Science doesn't "prove" facts.

While it would be silly to argue the facts, given all of our current evidence, in science the facts are not absolute. They are never proven.


Just widely agreed upon accross the board.