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What is clean coal technology?
science.howstuffworks.com/environmental/green-science/clean-coal.htm
Clean coal reduces the harmful emissions caused by the burning of fossil fuels. Learn about the development of clean coal and the uses for clean coal technology.
How can ozone be both good and bad?
science.howstuffworks.com/environmental/green-science/question162.htm
During the summer I am always hearing about ozone warnings in my city. This ozone is bad. But then I hear about the ozone layer, which is good. How can ozone be both good and bad?
1931 Harley-Davidson Model D
auto.howstuffworks.com/1931-harley-davidson-model-d.htm
The 1931 Harley-Davidson Model D motorcycle featured a new flathead engine. See pictures and learn about this classic Harley-Davidson motorcycle.
1955 Harley-Davidson FL Hydra-Glide
auto.howstuffworks.com/1955-harley-davidson-fl-hydra-glide.htm
The 1955 Harley-Davidson FL Hydra-Glide motorcycle offered a host of chrome options. See pictures and learn about this Harley-Davidson motorcycle.
Bird-Care Tips
animals.howstuffworks.com/pets/bird-care-tips.htm
Birds are among the most popular common house pets. Learn basic bird-care tips at HowStuffWorks.
Heather
home.howstuffworks.com/define-heather.htm
Heather is a shrub good for winter gardens, or as a ground cover or understory plant. Heather grows flowers in winter and spring. Learn about heather.
Materials
home.howstuffworks.com/materials.htm
The tools and methods you use depend upon the materials with which you're working. Learn about materials, and how they affect your home repairs.
Cane Toad Facts, Pictures
animals.howstuffworks.com/amphibians/cane-toad.htm
The cane toad is native to Central and South America, and an invasive species in Australia. It was introduced to Australia in 1935 to protect crops against cane beetles.
Early Twentieth Century Railroads
history.howstuffworks.com/american-history/early-twentieth-century-railroads.htm
Early 20th-century railroads saw major improvements in safety and comfort, as well as new regulations. Learn more about railroads in the early 1900s.
Benefits of Walking
health.howstuffworks.com/wellness/diet-fitness/exercise/benefits-of-walking.htm
The benefits of walking include a reduced risk of disease, improved sleep, less stress, increased energy, and more. Learn more about these benefits.