Lots of things – electromagnetic forces are stronger — you can hold an object up with a magnetic which prevents it from falling to the earth due to gravity. The magnet in this since is stronger than the entire earth!
There are other forces in atoms there are even stronger.
Pretty much everything. Gravity is a “weak force”, and it takes a lot of mass (e.g. the whole earth) to make any considerable effect. People are still trying to understand why gravity it so weak.
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