They meet in the middle, and they create subatomic particles like the charm quark and the tau lepton.

A proton contains two “up” quarks and one “down” quark.

So, one aspect of string theory, at its simplest form, is this: matter is made up of atoms, which are made up of protons and neutrons and electrons, which are made up of quark.

This quark is supposedly made up of little coiled strings, and it's the vibrations of these strings that make everything what it is.

So when two up quarks and a down quark are combined to make a proton, it has a total electric charge of plus one.

Quark in sentence

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