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How HeLa Cells Work
science.howstuffworks.com/life/cellular-microscopic/hela-cell.htm
While HeLa cells have been star players in medical research for decades, the woman behind them remained in the shadows for years. Discover the amazing story of Henrietta Lacks and her immortal cells in this article.
How Helicopters Work
science.howstuffworks.com/transport/flight/modern/helicopter.htm
Believe it or not, the marvel we know as the helicopter began as a Chinese top consisting of a shaft - a stick - adorned with feathers on one end.
How Helium Balloons Work
science.howstuffworks.com/helium.htm
Helium balloons tend to fascinate adults and children alike (and it's not just the Donald Duck voice thing, though that is a big draw). Learn all about helium and why it floats!
How Hereditary Illnesses Work
science.howstuffworks.com/life/genetic/how-hereditary-illnesses-work.htm
Hereditary illnesses can be frightening to new parents, but they are usually rare. Learn about various genetic diseases and their causes.
How High-tech Fabrics Cool You Down When You Heat Up
science.howstuffworks.com/innovation/everyday-innovations/cooling-fabrics.htm
Researchers are constantly developing fabrics that can help keep you cool, whether you're working out or trying to get a good night's sleep. But how do they work, and which are the best ones?
How Hollywood Screen Siren Hedy Lamarr Helped Pioneer WiFi and GPS
science.howstuffworks.com/innovation/famous-inventors/hedy-lamarr.htm
Hedy Lamarr's twin passions were acting and inventing. During World War II, she came up with a secret communication system that paved the way for technology like WiFi and GPS. But for decades, people thought this was an urban legend.
How Holograms Work
science.howstuffworks.com/hologram.htm
If you want to see a hologram, you don't have to look much farther than your wallet. But the most impressive holograms are large scale and illuminated with lasers or displayed in a darkened room with carefully directed lighting. Learn how a hologram, light and your brain work together make clear, 3-D images.
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!
How Hot Is Too Hot for the Human Body?
science.howstuffworks.com/life/biology-fields/how-hot-is-too-hot-outside.htm
Heat waves are becoming supercharged as the climate changes. How hot is too hot for normal daily activity, even for young, healthy adults?
How Hot Is the Sun? Colder, the Closer You Get!
science.howstuffworks.com/why-sun-atmosphere-hotter-than-surface.htm
How hot is the sun, and why does this star's atmosphere hit higher temperatures than its core? Read on to learn about the weird physics.