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Has Earth reached its carrying capacity?
science.howstuffworks.com/environmental/green-science/earth-carrying-capacity.htm
Carrying capacity is the idea that sustainability requires balance. Learn about carrying capacity and human population.
How Animal Testing Works
science.howstuffworks.com/innovation/scientific-experiments/animal-testing.htm
Animal testing has a long, gruesome history, but it's also saved countless human lives.
How does Dursban work?
home.howstuffworks.com/question440.htm
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
science.howstuffworks.com/math-concepts/scutoid-discover-new-shapes.htm
Spanish researchers recently uncovered a new geometric shape that allows human tissue to curve. But how?
How Currency Works
money.howstuffworks.com/currency.htm
Currency is a complex aspect of human civilization. Find out all about these symbols of financial value.
12 Big Cases of Revenge
history.howstuffworks.com/historical-events/10-biggest-cases-of-revenge.htm
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
health.howstuffworks.com/human-body/average-height-for-men.htm
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
science.howstuffworks.com/life/inside-the-mind/emotions/milgram-shock-experiment.htm
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.