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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.

Take this HowStuffWorks quiz to find out what you know about the summer and winter solstices and the spring and fall equinoxes.

HowStuffWorks heads to Tank Town USA to, you guessed it, see what it's like to drive a decommissioned military tank.

Before the widespread use of DNA, establishing the paternity of a child was a tricky business. Ever heard of the oscillophore?

We're talking the science of aging beer with the brewmasters of Sweetwater Brewery.

Where does water come from? We know that water surrounds us, but have you ever wondered about its origins? Find out where water comes from.

So what does that mean for good ol' Earth someday?

Whether you're a math whiz or not, there are some pretty cool number theories, beliefs and coincidences to appreciate. How down with digits are you?

You've probably had ice stick to your hand when you pull it out of the ice maker. But why is that?

One of America's national treasures is its diverse and bountiful fossil record. Take our U.S. states fossils quiz to learn more about fossils.