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Tretinoin Overview
health.howstuffworks.com/skin-care/problems/treating/tretinoin.htm
Tretinoin is a drug derived from vitamin A that has beneficial effects and some serious side effects, too. Learn about tretinoin at HowStuffWorks.
Oil Sands: Energy Evolution and Environmental Concerns
science.howstuffworks.com/environmental/green-science/oil-sands.htm
Oil sands are a mixture of clay, sand and water with a small amount of bitumen. Learn about oil sands, find out how energy intensive it is to refine oil sands.
5 Unusual Foods You Should Explore
recipes.howstuffworks.com/5-unusual-foods-you-should-explore.htm
There are some unusual foods you should explore including durian fruit and haggis. Check out 5 unusual foods you should explore.
How Parcheesi Works
entertainment.howstuffworks.com/leisure/brain-games/parcheesi.htm
Parcheesi has delighted adults and kids for thousands of years. How can a simple game like Parcheesi be so fun?
How Garbage-powered Cars Could Work
auto.howstuffworks.com/fuel-efficiency/biofuels/garbage-powered-car.htm
Garbage-powered cars aren't just science fiction. Read about the ins and outs of garbage-powered cars and running cars on solid waste.
Inside Unit 731, Japan's Gruesome WWII Human Experiment Program
history.howstuffworks.com/world-war-ii/unit-731.htm
Unit 731 was a covert biological warfare research unit of the Imperial Japanese Army during WWII. Some of the most heinous war crimes ever were committed there. Why is it still so shrouded in secrecy?
10 International Dishes Perfect for Summer
recipes.howstuffworks.com/menus/10-international-dishes-perfect-for-summer.htm
When it's summertime, you don't want your meals to sit too heavily. Check out these 10 international dishes perfect for summer.
450 Huge Geometrical Earthworks in the Amazon Hint at Past Civilizations
science.howstuffworks.com/environmental/earth/archaeology/amazon-geoglyph-earthwork-agroforestry.htm
Although the trenched enclosures were probably used to conduct rituals, they can tell us how the ancient indigenous people of the Amazon managed their forests.
What Is the Rosetta Stone and Why Is the Artifact Important?
science.howstuffworks.com/environmental/earth/archaeology/rosetta-stone.htm
Hieroglyphics used to be a language that no one -- Egyptian or otherwise -- could decipher. With the help of the Rosetta Stone, that all changed.
How Avalanches Work
science.howstuffworks.com/nature/natural-disasters/avalanche.htm
Learn how avalanches form, how long you can stay alive while buried under an avalanche and what steps you can take to survive.