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.
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.