Instinct for survival: Ways we've tried to stave off apocalypse
/ CBS News
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A South Korean man buys "Y2K Emergency Set" box, in a store in Seoul, South Korea on Dec. 27, 1999.
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Svalbard Global Seed Vault built to store seeds and protect them from natural disasters or nuclear strike, Longyearbyen, Norway, as seen in this photo taken on Feb. 25, 2008.
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An armed guard walks through the Svalbard Global Seed Vault, built to store seeds and protect them from natural disasters and nuclear strikes in Longyearbyen, Norway on Feb. 25, 2008.
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Cyril Houri, as owner of Safer America, demonstrates the Evacuchute system, a parachute for high-rise office workers, in this photo dated Aug. 27, 2003.
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Disaster goods for protection during earthquake on shelves in Tokyo, Japan, as seen on Aug. 31, 2000.
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A stockpile of survival ration crackers from the "Cold War" era in store room under the Brooklyn Bridge, New York, seen in this photo dated March 21, 2006.
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Middle school students climb ropes during winter survival camp, Seoul, South Korea, in this photo dated Jan. 1, 2001.
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Middle school students grimace pulling tires during winter survival camp in Seoul, South Korea, on Jan. 3, 2001.
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A gas mask, chemical suit, gloves, alarm, multipurpose emergency tool, flashlight and water canister as part of Quark International Limited's urban survival kit, as seen on Feb. 14, 2003.
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British Royal Marines practice Arctic Wilderness Survival training in this photo dated Feb. 7, 1998.
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A Swiss Army knife showing tools, including an integrated 128MB USB Memory Stick, as seen in this photo on March 23, 2004.