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A new global report says 1 million species are at risk of extinction - the greatest number in human history.

How tall is the average guy? It’s a question that bridges human biology, geography and public health.

Stanley Milgram's experiment was a controversial test of human psychology that shed light on the limitations of free will and obedience to authority.

Horror movies can reach down into the darkest depths of human consciousness and bring nightmares to life on screen.

Archaeology is the study of ancient civilizations and human remains, such as buildings, art or trash. Learn about archaeology and archaeologists.

In Greek mythology, goddesses held as much power as gods, embodying various aspects of nature and human experience.

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.

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