Of the four known forces, one of them stands out as different. Gravity is much weaker than the other known forces and nobody knows why. In this video, Fermilab’s Dr. Don Lincoln describes one possible explanation for the weakness of gravity – the existence of extra dimensions of space.

Long video: Extra dimensions
   • Big Mysteries: Extra Dimensions  

Observation of weak force in atoms:
https://www.futurity.org/weakforcea...

Fermilab physics 101:
https://www.fnal.gov/pub/science/part...

Fermilab home page:
https://fnal.gov