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Are human beings lonelier than we used to be? HowStuffWorks looks at the debate on loneliness.

Human beings are hard-wired to function better in a clean environment. HowStuffWorks looks at why.

The Velociraptors in "Jurassic Park" were roughly the size of humans. In reality, they were about the size of an average turkey.

The human eye misses a lot -- enter the incredible world of the microscopic! Explore how a light microscope works.

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?

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