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How Two-stroke Engines Work
science.howstuffworks.com/transport/engines-equipment/two-stroke.htm
A car engine uses a four-stroke cycle -- how can two strokes accomplish the same tasks? Learn all about the two-stroke engine, where it's used and how it compares to a four-stroke.
What Is a Green Roof?
science.howstuffworks.com/environmental/green-science/green-rooftop.htm
A green roof is a roof that is covered in plants, which reduces stormwater run-off and lowers cooling costs. Find out how a green roof can help the environment.
How Aerosol Cans Work
science.howstuffworks.com/innovation/everyday-innovations/aerosol-can.htm
They dispense everything from hairspray to cleaning products to whipped cream. Without them, you'd be doing a whole lot of pumping.
What is the urban heat island effect?
science.howstuffworks.com/environmental/green-science/urban-heat-island.htm
Cities are often hotter than rural areas because of the urban heat island effect. Learn what an urban heat island is.
Is ethanol really more eco-friendly than gas?
auto.howstuffworks.com/fuel-efficiency/alternative-fuels/ethanol-facts.htm
Ethanol facts help sort out which is better, ethanol or gas? Learn about ethanol facts, and find out if ethanol is more eco-friendly than gas.
How to Protect Skin from Pollution
health.howstuffworks.com/skin-care/beauty/skin-and-lifestyle/protect-skin-from-pollution.htm
Want to know how to protect skin from pollution? Visit HowStuffWorks to learn how to protect skin from pollution.
Top 5 Sunscreens for Athletes
health.howstuffworks.com/skin-care/beauty/sun-care/5-sunscreens-for-athletes.htm
Sunscreens for athletes should be sweat-proof. Visit HowStuffWorks to see the top 5 sunscreens for athletes.
6 Things to Know About Well Water Before Digging
home.howstuffworks.com/home-improvement/construction/planning/well-water.htm
Many homes in rural parts of the U.S. rely on well water rather than city water. But well water has pros and cons that city people may never have considered.
Do cows pollute as much as cars?
animals.howstuffworks.com/mammals/methane-cow.htm
Cow flatulence produces the greenhouse gas methane, which is linked to global warming. Find out how scientists are working to reduce cow flatulence in livestock.
Are bamboo floors really green?
home.howstuffworks.com/home-improvement/home-diy/flooring/bamboo-floors-really-green.htm
Green bamboo flooring is all the rave in these days of global warming. But how green is green bamboo flooring really?