I went to one of these talks 10 years ago as a student and it was well worth the cost. If you read the link, you'll see you get all 4 of his books (hardcover) a

I went to one of these talks 10 years ago as a student and it was well worth the cost. If you read the link, you'll see you get all 4 of his books (hardcover) as part of the $140. So basically for less than the price you'd pay on Amazon, you get the entire collection and get to hear a lecture from one of the smartest guys on the planet. Also, if the program hasn't changed you'll get to see some copies of books that belonged to Newton and Gallileo. Best $140 a nerd can spend.