Every now and then I find web sites of particular interest. Enjoy.

The following contain single page, well written descriptions about interesting ideas:
• Einstien’s Relativity Theory
• Gödel’s Incompleteness Theorem
• Russell's Paradox

Of course there is more about fonts and writing.
• Web Fonts
• dafont Fonts

Perception:
• Eye vs. Camera
• Video visual megapixels

Books:
• Just My Type: a book about fonts • by Simon Garfield