Strong Nuclear Force- The Strong Nuclear Force is responsible for binding protons and neutrons into "atomic nuclei". It is also the strongest of the four forces which implies why it is called the "Strong Nuclear Force". However it also has the shortest range, meaning the particles must be extremely close before its effects are felt.
(He bleeps himself out one time swearing, sorry if that's too offensive) This is Einstein's Theory of General Relativity
The Young Quantum Mechanics