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The world's largest collections of stored genetic material are found in Sussex, England, Spitsbergen, Norway - and Los Angeles.

Sussex hosts the Millennium Seed Bank, which houses some 750 million species of plant seed. Spitsbergen, an island less than 600 miles from the North Pole, is the site of the Svalbard Global Seed Vault, which safeguards - inside a tunnel, inside a mountain - every variety of all of the Earth's 21 major food crops. And Los Angeles is home to the California Cryobank, the largest sperm bank in the world, with enough human seed supercooled on-site to repopulate the planet several times over.

The first two projects are international efforts to preserve our genetic future; the last is a private enterprise on L.A.'s Westside run by a man occasionally known as "The King of Sperm."

The King of Sperm wears Buddy Holly glasses. He is of medium height and medium build, balding, 69 years of age, with a penchant for flashy shirts and comfortable shoes. His name is Dr. Cappy Rothman and "Cappy" is not a nickname. It is...