Some Time with Feynman by Leonard Mlodinow

In 1981 a young physics graduate joined the faculty at Caltech.  He was given an office on the same corridor as Murray Gell-Mann and Richard Feynman.  This is his account of his conversations with these two giants of 20th Century physics.  It is a small, slight book - I read it in one evening and two half-hour train journeys -  but is a marvelous read, both witty and warm.

Update on Sat 2005-08-27 by Tristram Brelstaff

In this book Feynman tells of how he once discussed with his son what it would be like if there were two time dimensions instead of just one.  I was very interested to read this because the same idea occurred to me just a few months ago, arising from my thinking on formal specification and object identity.