How Did the CIA Lose a Nuclear Device?

Sixty years after a team of American and Indian climbers abandoned a plutonium-powered generator on the slopes of Nanda Devi, one of the world's most forbidding Himalayan peaks, the U.S. government still refuses to acknowledge that the mission ever happened. The device, a SNAP-19C portable generator containing plutonium isotopes including Pu-239 -- the same material used in the Nagasaki bomb -- was left behind in October 1965 when a sudden blizzard forced climbers to retreat from Camp Four, just