Quantum Gravity: Strings or Loops? A Human Quest to Understand the Universe One of the greatest unfinished stories in modern science is our attempt to understand gravity at its deepest level. We have two incredibly successful theories that describe the universe—but they don’t get along. Quantum mechanics explains the strange, probabilistic behavior of particles at the smallest scales, while Einstein’s general relativity describes gravity as the smooth curvature of spacetime on cosmic scales. Eac

4.1K views · 79 reactions | Space-time is woven together from quanta of gravity, much like how a t-shirt is knitted together from a cotton thread.  Carlo Rovelli answers a question from the audience about loop quantum gravity. You can find the full talk here: youtube.com/watch?v=-6rWqJhDv7M Watch Carlo Rovelli's most recent Ri talk, on the birth of quantum physics: youtube.com/watch?v=B_HJtVX9fRM | Royal Institution of Great Britain | Facebook

For the longest time the question of what causes gravity was not so well understood. Watch particle physicist James Beacham tell us more | Royal Institution of Great Britain

Trying to explain Quantum Physics to a five year-old… | StarTalk