Theory of Everything | COSMOS in a minute #42

The biggest unsolved problem in science is finding the theory of everything or TOE. It would be a single equation that could describe everything in the universe, from the smallest subatomic particles to the largest galaxies. It would also explain how the universe began and how it will end. The TOE would unify the four known fundamental forces in nature: gravitation, electromagnetism, the strong force, and the weak force. String theory and M-theory have been proposed as candidates for the theory of everything. They are extremely complex mathematical frameworks, with some versions requiring the existence of as many as 26 dimensions, far more than what we can perceive. At present, there’s no experimental evidence in favor of these candidate theories. But physicists believe that it is only a matter of time before quantum mechanics and general relativity are reconciled in a TOE that explains everything. For more videos of Cosmos in a minute, follow The Secrets of the Universe.