- A brief history of mathematics , a one-hour crash course on the historical development of mathematics by John Dersch.

- Of triangles, gases, prices and men, a superb talk by Cedric Villani that describes the connections between seemingly very different fields of mathematics.

- An introduction to general relativity, a series of incredible lectures by Frederic Schuller, specifically aimed at mathematicians.

- The history of mathematics, a fascinating lecture course by Norman Wildberger that starts with Greek mathematics and ends with the development of non-Euclidean geometry.

- `The Character of Physical Law' , a series of lectures by Richard Feynman.

- Boltzmann and the Arrow of Time. A lecture by Leonard Susskind.

- A fascinating Feynman interview. Some real gems here.

- COSMOS by Carl Sagan. Compulsory popular science viewing.

- Functional Analysis lecture notes by Michael Struwe. The best introduction to Functional Analysis I've had the pleasure to read. In German unfortunately....

- The Feynman Lectures. Self-explanatory. Definitive introduction to college-level physics.

- How to write Mathematics, a short guide by Paul Halmos. Extremely valuable for researchers who are just starting to write mathematical articles.