48:34

8.01x - Lect 16 - Elastic & Inelastic Collisions, Center of Mass Frame of Reference

41:00

8.01x - Lect 19 - Rotating Objects, Moment of Inertia, Rotational KE, Neutron Stars

33:37

Something Strange Happens When You Trust Quantum Mechanics

50:05

8.01x - Lect 7 - Weight, Weightlessness in Free Fall, Weight in Orbit

21:01

Watch Trudeau speak directly to Trump during blistering speech

28:33

Terence Tao on how we measure the cosmos | The Distance Ladder Part 1

49:31

8.01x - Lect 30 - Simple Harmonic Motion, Energy Considerations, Torsional Pendulum

50:48

Gravitation' by Richard Feynman [1080p HD Video with clear audio]