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How Stem Cells Work

science.howstuffworks.com/life/cellular-microscopic/stem-cell.htm

Stem cells can develop into every cell, tissue and organ in the body. Learn about stem cell research challenges and controversy and how stem cells can be used to treat disease.

How Hot Air Balloons Work

science.howstuffworks.com/transport/flight/modern/hot-air-balloon.htm

Hot air balloons are about as simple as flying can get — no engine, no moving parts really, and very little the pilot can do to control the vehicle. Find out what it's like to fly a hot air balloon!

5 Countries That Ditched Their Military Forces

science.howstuffworks.com/5-countries-without-military-forces.htm

As Benjamin Franklin once quipped: "There never was a good war or a bad peace." That's why these five countries have gotten out of the military business entirely.

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