Title: Incredible Numbers by Professor Ian Stewart
Summary: Beautiful exploration of fascinating math beyond classroom topics
Pros: Fantastic visualizations and interactive explorations, deeply informative text, and easy-to-navigate interface all make pure math come alive.
Cons: Long sections of dense academic text with tricky vocabulary and sometimes-serpentine hyperlink trails will undoubtably alienate some users.
Bottom Line: For students who get bored by the usual curriculum, this tool will open their eyes to math's deepest problems and most curious corners.
Read more here.