Nima Arkani-Hamed gave a 90-minute public lecture on unification, relativity, QFT, scales in physics, the LHC, and other key things. I have modified the name of the collider in the title because this blog is way more polite than the prícks at Princeton. ;-)
You may also go to high-resolution and low-resolution MP4 file.
Nima focuses on the hierarchy problem (the Higgs' unbearable lightness of being) and the cosmological constant problem - and their solutions, including supersymmetry etc.
Bonus: admissions at USC
An interesting story: Clifford Johnson has been bullied by a mediocre physicist who nevertheless wanted to become a USC graduate student, despite having totally lousy scores and other objective parameters, in order to improve the weather (he lives in a very cold state now).
Clifford wasn't able to tell him to f*ck off, and as a result, he has missed a talk by a Nobel prize winner.
That's how it works: if you can't authoritatively deal with obnoxious, pushy, and stupid as*holes, they will beat the battle for your time - and influence in general - against the Nobel prize winner or anyone else who has something to offer.