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Your search for "time travel" returned 802 results
How Customs Works
science.howstuffworks.com/transport/flight/modern/customs.htm
To most people a trip through customs is just another stop in an airport or a country's borders. But customs agencies do much more for their countries' governments. In fact U.S. Customs raises more revenue than any agency except the IRS. Find out why and how they do it.
Why Is the Sky Blue?
science.howstuffworks.com/nature/climate-weather/atmospheric/sky.htm
We've all probably looked up and wondered why the sky is blue instead of, say, brown. The sky is blue because of the way Earth's atmosphere scatters light from the sun.
How Zero-gravity Flights Work
science.howstuffworks.com/zero-g.htm
Zero gravity flights are used to simulate a zero gravity environment for astronauts in training. Find out how zero gravity flights simulate weightlessness.
When Is the Earth Going to End?
science.howstuffworks.com/environmental/earth/geology/earth-500-years.htm
The end of Earth will likely come about because of the sun in our solar system. This much you might already know, but we actually have an approximate date.
What Really Happened to Yuri Gagarin, the First Man in Space?
science.howstuffworks.com/yuri-gagarin.htm
He stood just 5 feet, 2 inches. But Gagarin cast an enormously long shadow in space exploration, both for his achievements and his mysterious death.
Tidal Bores Are Rare, Fast and Have Epic Waves
science.howstuffworks.com/environmental/earth/oceanography/tidal-bores-fast-rare-epic-waves.htm
The rare phenomenon of tidal bores happens in only a few places on the globe. HowStuffWorks looks at the conditions it takes for bore tides to occur.
10 Innovations in Water Purification
science.howstuffworks.com/environmental/green-tech/sustainable/10-innovations-water-purification.htm
As far back as 1500 B.C.E., people were trying to purify water to make it drinkable. And we're still at it. Today inventors use tools as simple as clay and as sophisticated as carbon nanotubes to bring clean water to the world.
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 Lightning Works
science.howstuffworks.com/nature/natural-disasters/lightning.htm
Lightning is an incredible force of nature. And like many natural phenomena, lightning is not always what it seems. Go behind the mystery and learn what's really going on when lightning strikes.
What Is a White Hole? Does the Cosmic Phenomenon Exist?
science.howstuffworks.com/white-hole.htm
Black holes have long held the spotlight as celestial objects from which nothing, not even light, can escape. However, theoretical physicists propose a less understood but equally fascinating counterpart: the white hole.