If you are curious , I recommend you the web site of "Diffusion des Savoir" some videos are in english, it's a sort of TED talk but with 1 hour videos instead of 5 min

http://www.diffusion.ens.fr/

To have a quick look, here is one of my favorite video

http://www.diffusion.ens.fr/index.php?res=conf&idconf=994#

have fun