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Anyone who's ever regretted a haircut has probably wondered how fast their hair will grow back. It's a good question, with a not-so-simple answer.

To a human it's unimaginable - sniffing another's derriere. But to our canine companions, it's totally normal. But why? Why?

The Malthusian premise centers on the issue of whether or not there will be enough food to sustain human life. Learn about the Malthusian premise.

Parasites are creepy to begin with. They live on or in a host, including humans. Some even lay eggs in our skin!

The ultimatum game is a form of economics experiment that provides insight into the human psyche. Learn about the rules to the ultimatum game.

Dogs lick humans for all types of reasons. But do they really lick us to tell us they love us?

Evolution is a never-ending process, but some scientists believe it might be speeding up as human activity impacts the environment.

The largest eagle in the world has a claw the size of a grizzly bear's, a leg the size of a human's and a very disapproving gaze.

Not all human foods are safe for dogs to eat. HowStuffWorks looks at 10 foods that are toxic to dogs.

We make a big deal about modern humans being smarter than Neanderthals, but, really, are we?

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