Well, just for fun, mankind has no idea what "gravity" is. They just gave this mysterious force a name with some observational measurements.
We think we know what an atom is but can't explain protons. They are suppose to repel each other (same charge) but it actually takes an atomic explosion to break them apart.
Know one knows what light is or why it travels exactly the same speed. What even makes it travel/move in the first place.
Electricity can only be explained with "IMAGINARY" numbers that do not exist. (Square root of negative one)
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