[Dimensio]

About gravity, kids can prove it exists by dropping stuff on the floor.

This does not prove gravity. This merely demonstrates that a force acted upon the "stuff" in a specific fashion for each instance. Dropping "stuff" on the floor does not explain why the "stuff" falls to the floor in the first place. Gravitational theory is required for such an explanation, and not only his the theory behind gravity not proven, but it is a far less well-understood phenomenon than evolution.

[Coyoteman]

===> Placemarker <===

(though I am not sure why)

[annalex]

This does not prove gravity

It proves existence of gravity. I think my post makes the distinction between existence of a phenomenon and the mechanisms of it clear.