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/Mtheory