Search Results | human population
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How the Environment Has Changed Since the First Earth Day 51 Years Ago
It's been 51 years since the first Earth Day, and while progress has been made in some areas, humanity still has had a major impact on the planet.
How Light Microscopes Work
science.howstuffworks.com/light-microscope.htm
The human eye misses a lot -- enter the incredible world of the microscopic! Explore how a light microscope works.
10 Questions in the U.S. Health Care Cost Debate
people.howstuffworks.com/10-questions-in-u-s-health-care-cost-debate.htm
Why does health care cost so much? And, why isn't the population any healthier? Learn the biggest U.S. health care cost debates at HowStuffWorks.
Where Do Horses Originate From? Not Europe, Not Asia
animals.howstuffworks.com/mammals/where-do-horses-originate-from.htm
Where do horses originate from? We don't mean to sound corny, but the answer really does take us on a journey through millions of years of evolution, migration, and domestication.
Regal Jumping Spider: Tiny, Harmless, Maybe Even Cute
animals.howstuffworks.com/arachnids/regal-jumping-spider.htm
The regal jumping spider (Phidippus regius) is a fuzzy spider that's named for its incredible jumping ability and vivid colors. They have four forward-facing eyes, giving them better vision than other spiders.
The Rainbow Snake Feasts on American Eels
animals.howstuffworks.com/snakes/rainbow-snake.htm
The rainbow snake (Farancia erytrogramma) - sometimes called an eel moccasin or red-lined snake - is a nonvenomous snake. It has vibrant coloration and a specialized diet. Humans rarely see rainbow snakes (despite their striking appearance) because they spend much of their lives hidden in aquatic habitats.
9 Deep-diving Facts About the Lands of Oceania
history.howstuffworks.com/world-history/oceania.htm
Fourteen countries and 39 million square miles make up Oceania in the South Pacific. And bungee jumping was invented there, too.
Phthalates Are Everywhere and Scientists Are Worried
health.howstuffworks.com/wellness/phthalates.htm
Phthalates are chemicals that make plastics stronger and they're in just about everything you touch. But are they harmful to your health?
How Polar Bears Work
animals.howstuffworks.com/mammals/polar-bear.htm
Polar bears are iconic for their shocking whiteness, ferocity and sheer size. Learn about polar bears, polar bear diet and polar bear habitat.
The Banded Water Snake Is an Opportunistic Hunter
animals.howstuffworks.com/snakes/banded-water-snake.htm
The banded water snake is one of the most fascinating aquatic reptiles you'll find slithering through the waterways of the southeastern United States.