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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.

How Human Cloning Will Work

science.howstuffworks.com/life/genetic/human-cloning.htm

Human cloning has been an ethical issue ever since the first sheep was cloned in 1997. Learn about the science behind human cloning.

How Human Memory Works

science.howstuffworks.com/life/inside-the-mind/human-brain/human-memory.htm

Human memory is a complex, brain-wide process that is essential to who we are. Learn about encoding, the brain, and short- and long-term memory.

How Human Migration Works

science.howstuffworks.com/life/evolution/human-migration.htm

Human migration is the idea that humans developed in Africa and then spread to Europe and Asia. Learn about human migration and how human migration works.

How Hurricanes Work

science.howstuffworks.com/nature/natural-disasters/hurricane.htm

How often have you watched a weather forecaster point to a spiral-shaped cloudy mass with a sense of dread and fascination? What fuels these ferocious storms?

How Hydraulic Cranes Work

science.howstuffworks.com/transport/engines-equipment/hydraulic-crane.htm

Hydraulic cranes perform seemingly impossible tasks, lifting 70-ton objects with absolute ease. See the simple design behind the Herculean results.

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