I loved both those Brian Greene books!!! Oh, they are SOOOOOOO good! I could hardly get to sleep at night because I was trying to read them, and woke up way early so I could read them some more! Have you seen the DVD of "The Elegant Universe"? Very cool.
My latest sleep-eliminating book was "The Woman With The Alabaster Jar" by ? Starbird. It's one of the books used by Dan Brown when he wrote "The DaVinci Code." (which I found to be tedious, maybe because I'd read Starbird's book first)
Also, find "Lamb", by some dude who's name I can't remember. It's the Gospel of Biff, Joshua's best friend. Very irreverent, but very sweet. (he also wrote "Island of the Sequined Love Nun" which I haven't read yet)
Probably much more fun than Meacham's book.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson