These tiny subatomic particles defied the known laws of physics to suggest that there may be a fifth fundamental force at play. And this puts up a challenge to the Standard Model of Physics.

Of the four known fundamental forces of nature, the weak nuclear force is the one with the least obvious purpose. Gravity holds stars together and keeps us on the ground. The electromagnetic force ...

That at least is the case with the strong nuclear force, one of four fundamental forces of nature (the others being electromagnetism, gravity and the weak nuclear force). The strong force holds ...