What is the Theory of Everything, and why is it so important? This video explores the science behind this elusive goal, from string theory to the search for a unified understanding of reality.

For centuries, the principle of symmetry has guided physicists towards more fundamental truths, but now a slew of shocking findings suggest a far stranger idea from quantum theory could be a deeper dr ...

The Standard Model of our universe doesn’t match the evidence, in part because of dark energy, a ghostly force pushing the ...

Is string theory in trouble? 😵‍💫 Neil deGrasse Tyson breaks down the latest debates in physics, explaining the challenges ...

The first massive level of closed bosonic string theory is studied. Free-field equations are derived by imposing Weyl invariance on the world sheet. A two-parameter solution to the equation of motion ...

I describe our understanding of physics near the planck length, in particular the great progress of the last four years in string theory. Superstring theory, and a recent extension called M theory, ...