Gravity in past ages: dinosaurs, weight lifting, etc.
Albert Einstein tried to describe gravity as a sort of a four-dimensional differential geometry thing. Plainly, you cannot start with that and have an easy time believing that gravity near our own planet's surface could have undergone some kind of a major change within geologically recent times, but it is an easy demonstration that it has, and that a large dinosaur would be crushed by its own weight in our present gravity.
http://www.bearfabrique.org/FBook_Utube_Materials/gravity_PastAges.pdf
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