Therefore, while there are countless forces in nature, there is only one that we really need to discover: the force of giving, the desire to give. This will reveal to us the physics of happiness.

Classroom Activity for the NOVA program Elegant Universe, The: Einstein's Dream: In Forces of Nature, students study about the four fundamental forces and the interactions they govern. Grades 9-12.

In physics, there are four fundamental forces known to exist – these include gravity, electromagnetism, the strong force and the weak force, and they govern how all the objects and particles in ...

Several years ago, scientists at Fermilab suggested they were on track to discover a new fundamental force, and this time there's no backtracking.

However, since the mid-1980s, physicists have wondered if a fifth fundamental force could exist, which would help to explain some observational anomalies.

Public confidence in the "constants" of nature may be at an all time low. Recent research has found evidence that the value of certain fundamental parameters may have been different in the past.