The Perimeter Institute has videos of classes of all of their areas of research:
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Gravity/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Superstring_Theory_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Foundations_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Cosmology_%26_Gravitation/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Particle_Physics_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Information/
Scroll to the bottom for the lectures.
A lecture from 2005 by Roger Penrose on the pre-Big Bang and Weyl Curvature.
INI Web Seminars: Penrose, 2005-11-07
This one is quite good. “Time is nothing to a photon.”
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Physics Video Lectures
The Perimeter Institute has videos of classes of all of their areas of research:
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Gravity/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Superstring_Theory_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Foundations_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Cosmology_%26_Gravitation/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Particle_Physics_/
http://www.perimeterinstitute.ca/en/Outreach/What_We_Research/Quantum_Information/
Scroll to the bottom for the lectures.
A lecture from 2005 by Roger Penrose on the pre-Big Bang and Weyl Curvature.
INI Web Seminars: Penrose, 2005-11-07
This one is quite good. “Time is nothing to a photon.”