During my teenage years, which precisely spanned Ronald Reagan's presidency, reading Jonathan Schell's morbid, spellbinding antinuclear tract The Fate of the Earth fueled my fears of nuclear war. Freeman Dyson's Weapons and Hope provided a needed antidote. Dyson showed that it was possible to be passionate about nuclear weapons without being desperate; pro-disarmament without being unrealistic. It's good to see that Dyson's passion and optimism haven't flagged. In The Sun, the Genome, and the Internet, he displays a similar childlike enthusiasm about the possibilities for humanity's future, informed and tempered by a physicist's understanding of the real world.

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