Search Results | human population
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Can You Name All of These Animals That Start With Vowels?
play.howstuffworks.com/quiz/can-you-name-all-of-these-animals-that-start-with-vowels
There are more animals out there than can be named, so we thought we would start with just the ones that begin with a vowel. Jump into this quiz and see if you can name them as well!
10 Scientific Breakthroughs We Literally Couldn't Live Without
You might argue we have scientists to thank for our own survival. What breakthroughs have kept the human race from dying out?
10 of the Oldest Continuously Inhabited Cities in the World
history.howstuffworks.com/world-history/oldest-city-in-world.htm
It's hard to nail down the oldest city in the world. Some say it's Damascus, Syria, while others suggest it's Jericho, in the West Bank. So which is older?
10 Wacky Forms of Alternative Energy
science.howstuffworks.com/environmental/green-science/five-forms-alternative-energy.htm
Wacky forms of alternative energy include using human energy as power and bugs that make fuel. Learn about the wacky forms of alternative energy.
12 Deadly Diseases Cured in the 20th Century
health.howstuffworks.com/diseases-conditions/rare/12-deadly-diseases-cured-in-the-20th-century.htm
Diseases like polio and smallpox took countless lives before a cure was found. Read our list of 12 diseases that were cured in the 20th century.
Northern Water Snake: Nonvenomous and Ecologically Essential
animals.howstuffworks.com/snakes/northern-water-snake.htm
The northern water snake (Nerodia sipedon) is a common and widespread nonvenomous snake in North America. These aquatic snakes typically live in and around freshwater bodies - lakes, rivers and wetlands - where they play a crucial role in the ecosystem.
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.
How Brain Mapping Works
science.howstuffworks.com/life/inside-the-mind/human-brain/brain-mapping.htm
Brain mapping attempts to provide a complete picture of the brain's structure. Learn how brain mapping works and why it's such a scientific breakthrough.
The Smallest Bat in the World Is the Size of a Bumblebee
animals.howstuffworks.com/mammals/smallest-bat-in-the-world.htm
The smallest bat in the world is so tiny it can easily fit on the tip of a human finger. Known commonly as the bumblebee bat, this remarkable animal weighs about as much as a small coin and is often compared to a large bumblebee in size.
Evolution by Natural Selection: Examples and Effects of Adaptation
science.howstuffworks.com/life/evolution/natural-selection.htm
Natural selection is the idea that organisms that are best suited to survive pass their traits down. Is it true that only the strong survive?