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Is there really water on Mars?
science.howstuffworks.com/water-on-mars.htm
Photographs have recently shown that there may be water on Mars. Find out if there's water on Mars and what that could mean for life on Mars.
How the California Air Resources Board (CARB) Works
auto.howstuffworks.com/fuel-efficiency/fuel-economy/carb.htm
The California Air Resources Board regulates air quality in the state of California. Find out more about the California Air Resources Board in this article.
How Sword Making Works
science.howstuffworks.com/sword-making.htm
The centuries-old art of sword making involves incredibly intricate metal work, and it's still being practiced today. Get a rare glimpse into the creation of this ancient weaponry.
How Aliens Work
science.howstuffworks.com/space/aliens-ufos/alien-physiology.htm
Alien life forms would probably differ from those on Earth but still adhere to certain principles. Learn about astrobiology and the search for alien life forms.
How Igloos Work
people.howstuffworks.com/igloo.htm
Igloos may be made by the Inuit as temporary houses to use on fishing and hunting expeditions. Read about igloos and find out how to build an igloo.
10 Problems Cars Can Diagnose By Themselves
Limiting this list to just 10 problems cars can diagnose by themselves was the difficult part. Learn how cars diagnose themselves at HowStuffWorks.
How to Choose a New Water Heater
home.howstuffworks.com/how-to-choose-a-water-heater.htm
How to choose a water heater covers everything you should look for when purchasing a water heater for your home. Learn about choosing a water heater.
10 Tips for Eco-friendly Cooking
science.howstuffworks.com/innovation/edible-innovations/10-tips-eco-friendly-cooking.htm
Going green isn't just a fad anymore; it's now a way of life for millions. Want to get started? Look no further than your kitchen. In fact, a simple water filter is all you need to start eco-friendly cooking.
Can You Name All of These World Heritage Sites?
play.howstuffworks.com/quiz/can-you-name-all-of-these-world-heritage-sites
We only have one Earth, and the easiest way you can show your appreciation for it is by recognizing its brilliance. Some of the world's most endangered animals, oldest cities and rarest land formations are protected in World Heritage Sites around the globe. Put your skills to the test and see if you can recognize them all.
Can air pollution affect heart health?
science.howstuffworks.com/environmental/green-science/air-pollution-heart-health.htm
Air pollution can negatively effect heart health. Learn about air pollution and its connection to heart health.