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Has Earth reached its carrying capacity?

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Carrying capacity is the idea that sustainability requires balance. Learn about carrying capacity and human population.

How Animal Testing Works

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Animal testing has a long, gruesome history, but it's also saved countless human lives.

How does Dursban work?

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How does the pesticide Dursban work? Does it have the same effect on humans that it has on insects?

The Scutoid: How We Discover New Shapes

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Spanish researchers recently uncovered a new geometric shape that allows human tissue to curve. But how?

How Currency Works

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Currency is a complex aspect of human civilization. Find out all about these symbols of financial value.

12 Big Cases of Revenge

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The concept of revenge predates legal history. But sometimes the need for vengeance can kick into overdrive - as in these 12 infamous acts of revenge.

Are We Entering the Sixth Major Extinction on Earth?

science.howstuffworks.com/life/evolution/sixth-major-extinction.htm

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

The Average Height for Men Varies Widely Around the World

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

Milgram Shock Experiment: A Vital Lesson in Social Psychology

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

16 Binge-worthy Horror Anime to Give You Nightmares

entertainment.howstuffworks.com/horror-anime.htm

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

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