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An electric sander removes material from a surface with much greater speed than sanding by hand. Learn more about sanders.

The megalodon was born as big as an adult great white and grew to weigh as much as 7 Tyrannosaurus rex. Learn all about the megalodon.

Keystone species in an ecosystem function much like a keystone in an arch. Without them the structure collapses. Learn about keystone species.

Legend says that jackalopes roam the plains of Wyoming and even like to sing campfire songs. How much truth is there to this mythical creature?

They took thrash metal from the back rooms to the biggest stadiums. How much do you really know about Metallica?

Cast your ballot to these questions to find out how much you know about the history of U.S. presidential elections.

HowStuffWorks finds out why sloths expose themselves to so much danger by leaving their tree homes to poop on the ground.

They are the most notorious species of shark, boasting 3,000 jagged teeth and a bite that kills. See how much you know with this quiz.

Biotin is a vitamin that aids in the metabolism of food. Learn how it works, how much of it you should eat and which foods contain biotin.

Life on the water is different than life on land. How much do you know about boating? Take this quiz to find out.

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