Quote Originally Posted by Sasaki Kojiro View Post
Gasoline is flammable, water becomes ice when it gets cold enough, corn needs water and sunlight to grow, there is a placebo effect, etc.

There's an absurd amount of silly things said about science and proof for some reason.
We don't "prove" observable things, if you want to be really technical about it. Over time we have seen these observable phenomena and have constructed around them explanations which satisfy the ability to be proven wrong and that adequately predict such events and future events.