Six Not-So-Easy Pieces, Richard P. Feynman
If you like your physics this might be worth a go. These are definitely the "not-so-easy" pieces. I have to admit skimming over most of the equations.
Permutation City Blog
1 to 1 of 1 on 2007-01-10 
: Prev Next
: Prev Next
1 to 1 of 1 on 2007-01-10 : Prev Next
: Prev Next