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Comment What causes gravity? (Score 5, Interesting) 236

That boggles the mind. Even something as fundamental to our daily experience as gravity, and we don't know what it is. We describe its effects, and we have a few theories about its cause, but when an apple falls out of a tree, we don't know why it falls to the ground.

The fact of this ignorance should be taught in the first lesson.

I THINK MAN INVENTED THE CAR by instinct. -- Jack Handley, The New Mexican, 1988.