Mobius موبيوس

Beginner

Cosmos: A Personal Voyage (TV series) Carl Sagan

Easy

The Elegant Universe (NOVA documentary) Brian Greene Particle Fever (documentary) Mark Levinson

Medium

The Character of Physical Law (lectures) Richard Feynman The Mechanical Universe (Caltech series) David Goodstein

Hard

The Unreasonable Effectiveness of Mathematics in the Natural Sciences (article) Eugene Wigner

Extreme

More Is Different (article) P. W. Anderson