Signs and symptoms. 1  Pain on the outer side of the thigh, occasionally extending to the outer side of the knee, usually constant. 2  A burning sensation, tingling, or numbness in the same area. 3  Multiple bee-sting like pains in the affected area. 4  Occasionally, aching in the groin area or pain spreading across the buttocks.
And the reason they don't is because of the strong nuclear force. In physics, there are four fundamental forces: gravity, the electromagnetic force, the weak force, and the strong force. The strong force is, unsurprisingly, strong. The strong force is the force that holds the nucleus of the atom together, even through other forces want to pull it apart. The electrostatic repulsion (part of the electromagnetic force) between the positive protons in the nucleus is very powerful.
Iron atom diagram. The protons inside the nucleus of an atom all have a positive electrical charge, so they push away from each other. But the strong nuclear force pulls the protons together. As you might think from the name, the strong nuclear force is very strong. It is stronger than electricity or gravity. But the strong nuclear force only works when it is very close to something.