Adam Keller was 13 when he first became a peace activist. It was a couple of years after the 1967 War, and the Occupation of the West Bank and Gaza. A schoolmate of his told the class that if they wanted to do something worthwhile, they should come with him that evening. His offer was too tantalizing to refuse: warnings about not being followed, a secret knock on a basement door. It seemed at first mysterious, dangerous and romantic.