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How Tooth Whitening Works
science.howstuffworks.com/innovation/everyday-innovations/tooth-whitening.htm
In the past few years, tooth-whitening has exploded as the physical upgrade of choice. Unlike nose jobs and chin tucks, just about anybody can afford to try this at home. Learn about different whitening techniques and how they work, and decide if you should give it a try.
How Tower Cranes Work
science.howstuffworks.com/transport/engines-equipment/tower-crane.htm
Tower cranes rise 150 feet in the air and lift up to 19 tons. Plus, they actually build themselves! They're simply amazing. Learn how these structures accomplish such feats.
How Trains Work
science.howstuffworks.com/transport/engines-equipment/train.htm
We humans are mobile. Long before flight, FusionMan or even your average automobile arrived on the scene, trains were transporting us all over civilization. How did we get from horse-drawn carts to high-speed trains?
How Transparent Aluminum Armor Works
science.howstuffworks.com/transparent-aluminum-armor.htm
Transparent aluminum armor can stop armor-piercing bullets that travel miles. See how transparent aluminum armor works and why you can see through it.
How Tsunamis Work
science.howstuffworks.com/nature/natural-disasters/tsunami.htm
Tsunamis are water walls that travel faster than jets. See pictures, footage and diagrams of tsunamis, look at famous tsunamis and learn how tsunamis are born.
How Tuning Forks Work
science.howstuffworks.com/tuning-fork.htm
Pianos lose their tuning, guitars fall out of key -- even church organs need to be tuned every now and then. For centuries, the only sure-fire way to tell if an instrument was in tune was to use a tuning fork.
How Tunnels Work
science.howstuffworks.com/engineering/structural/tunnel.htm
Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.
How Twinkies Work
science.howstuffworks.com/innovation/edible-innovations/twinkie.htm
Twinkies are an icon of junk-food snacks and guilty pleasures. Learn about Twinkies and find out if a Twinkie can really sit on the shelf for 30 years.
How Twins Work
science.howstuffworks.com/life/genetic/twin.htm
Twins are unique people who are also eerily similar to each other. Do twins really have ESP? Learn how twinning happens and what types of twins are out there.
How Two-stroke Engines Work
science.howstuffworks.com/transport/engines-equipment/two-stroke.htm
A car engine uses a four-stroke cycle -- how can two strokes accomplish the same tasks? Learn all about the two-stroke engine, where it's used and how it compares to a four-stroke.