Gravity?

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I once read that a theory explaining why gravity was so weak was because it had to spread across all 4 of the dimensions in the universe.

 

(sub atomic particles do feel gravity it's just very weak)

Just a point: Graivty has never been observed on an atomic (or subatomic scale). That is gravity is so weak at that scale it is totaly undetectable with modern equipment. This is part of the problem of observing the graviton.