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Why Does Earth Spin?
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Every 24 hours, Earth makes a full rotation on its axis. But why does Earth spin in the first place?
What Is the Chandler Wobble?
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The Chandler wobble is the change in the spin of Earth on its axis. Learn more about the Chandler wobble at HowStuffWorks.
Why Are Planets Almost Spherical?
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None of the planets in our solar system are perfect spheres, nor for that matter is our sun. Learn more about oblate spheroids at HowStuffWorks.
Venus: Earth's Blazing-hot and Bizarre Twin
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The atmosphere is crushing on Venus, and it's so hot lead would melt. But the planet still has a lot in common with Earth. We'll explain.
How the Sun Works
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The sun warms our planet every day, provides the light by which we see and is necessary for life on Earth. Learn about the sun.
Earth: A Primer on the Third Rock From the Sun
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Earth is an enormous and extremely complex planet. Learn about the inner workings of the planet Earth and find out what forces are constantly at work on Earth.
How did ancient civilizations use sundials to tell time?
electronics.howstuffworks.com/gadgets/clocks-watches/ancient-civilizations-use-sundials.htm
Ancient sundials first popped up in Egypt around 1500 B.C. Learn how these sundials came about and what they were used for all those centuries ago.
How Laser Weapons Work
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Laser weapons have been depicted in science fiction for years, but they do exist in real life. Learn more about laser weapons.
What Is the Arctic Circle? 9 Stone-cold Facts About the Region
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The Arctic Circle is a region marked by frigid temperatures, strange sunlight and glaciers galore. And for hundreds of thousands of people, it's also home sweet home.
Nature Garden Activities for Kids
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Nature garden activities for kids teach about nature. Plant a box garden, build a pumpkin tunnel, or grow carrots with nature garden activities.