1. The singular Vi Hart’s beautiful three part exposition of the Fibonacci sequence, culminating in a clear explanation of why it shows up in plants. (Hint: It’s not magic.)
  2. This bygone film from Chevrolet explaining with incredible clarity the mechanics of the differential in your car.
  3. The brilliant computer scientist Grace Hopper explains a nanosecond.
  4. Preeminent physicist Richard Feynman explains what keeps trains on tracks.
  5. Author Susan Caine explains why introversion should be embraced rather than stigmatized.
  6. Author John Green explains (ostensibly to teens) why reading matters, with sincerity and humor.
  7. Professor Moriarty from the University of Nottingham explains quantum tunneling.
  8. Beloved astronomer Carl Sagan movingly explains why an astronomical perspective is anything but nihilistic.