Quarks

Protons are made up of quarks.

What are quarks made of?

Gluons glue quarks together to form particles such as protons.

The strong interaction binds quarks into nucleons and nucleons to each other.

The binding energy between quarks constitutes 99 percent of proton and neutron mass.

The binding energy between quarks in a nucleon is equal to its mass times the speed of light squared.

The strong force binds quarks.