M Theory | Towards a theory of everything?

How can gravity and the quantum world be unified? What are the different string theories? And what is "M theory"? All these answers in 17 minutes!

0:00 - Introduction
3:03 - Supergravity
4:40 - Superstrings
6:59 - A link between theories
8:35 - Dualities
13:34 - Towards M theory...

This video is narrated by Octave Masson.
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Alessandro Roussel,
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To learn more :
https://en.wikipedia.org/wiki/M-theory