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Trig Identities: A Crash Course in Complex Math Concepts
science.howstuffworks.com/math-concepts/trig-identities.htm
Fundamental trigonometric identities, aka trig identities or trigo identities, are equations involving trigonometric functions that hold true for any value you substitute into their variables.
How Sliding Puzzles Work
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Sliding puzzles involve moving pieces around a board to reveal an image or achieve a goal. Learn how sliding puzzles work at HowStuffWorks.
How to Stencil a Kitchen
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Look to stencils for a great way to personalize your kitchen. Check out this article for wonderful stencil projects, photos, and stencil downloads.
How Electricity Works
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Electricity surrounds us and can be used thousands of different ways. Learn about the basics of electricity, from generators and electrical circuits to voltage and currents.
Exterior Paints
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Choosing the right exterior paints can be complicated. See this list of exterior paints, and find out which one will work best for your project.
How Autofocus Cameras Work
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Ever wonder how your camera knows what you're looking at? Understand how autofocus cameras lock on to the object you're photographing!
How the Terracotta Army Works
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The Terracotta Army was commissioned under Emperor Qin as protection for the afterlife. Learn why the Terracotta Army isn't as unique as it is massive.
Ultimate Guide to the Basilicata Wine Region
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The Basilicata wine region is among Italy's best. Learn all about the Basilicata wine region at HowStuffWorks.
What Makes a 'Killer' Lake Explode?
science.howstuffworks.com/environmental/earth/geophysics/what-makes-killer-lake-explode.htm
Lakes seem like serene places to escape and enjoy peace and quiet. So you'd probably be surprised to learn that a lake can actually explode without warning. It's happened, with deadly consequences.
5 of Earth's Highest Deserts
science.howstuffworks.com/environmental/earth/geology/high-deserts.htm
Not all deserts have sand and they're certainly not all hot. They're just extremely dry and have little vegetation. That means deserts are located all over the planet, including at super-high elevations.