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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 Robot Armies Will Work
science.howstuffworks.com/robot-armies.htm
Robot armies could soon account for up to one third of all vehicles currently in service. Learn about robot armies and robot army development.
How Charles Darwin Worked
science.howstuffworks.com/life/genetic/charles-darwin.htm
How did Charles Darwin develop the idea of natural selection? And how did Charles Darwin and "The Origin of Species" change our thinking and our world?
Does Stress Really Make Your Hair Go Gray?
health.howstuffworks.com/wellness/aging/aging-process/stress-gray-hair.htm
Does stress really cause gray hair? Explore this article to find out where gray hair comes from and what role stress plays in its development.
NASA's 10 Greatest Achievements
science.howstuffworks.com/ten-nasa-achievements.htm
NASA's 10 greatest achievements range from technical feats to displays of human ingenuity. Learn about NASA's 10 greatest achievements.
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.
How Archaeology Works
science.howstuffworks.com/environmental/earth/archaeology/archaeology.htm
Archaeology is the study of ancient civilizations and human remains, such as buildings, art or trash. Learn about archaeology and archaeologists.
What are the benefits of hydrogen-powered vehicles?
auto.howstuffworks.com/fuel-efficiency/alternative-fuels/hydrogen-vehicle-benefit.htm
As new fuel sources are developed, some people wonder about hydrogen car benefits. Learn about some of the hydrogen car benefits in this article.
The Worst Air Quality in the World Is in Mountainous Terrain
science.howstuffworks.com/environmental/green-science/worst-air-quality-in-the-world.htm
Air pollution is widely recognized as a major threat to public health, and while air quality data is widely available, the large-scale solutions are often difficult to enact. There are efforts in most developed countries to improve air quality, and pretty much everyone (except the polluters) agrees that it's an urgent problem.
How Stem Cells Work
science.howstuffworks.com/life/cellular-microscopic/stem-cell.htm
Stem cells can develop into every cell, tissue and organ in the body. Learn about stem cell research challenges and controversy and how stem cells can be used to treat disease.