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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.
Why do humans walk on two legs?
animals.howstuffworks.com/mammals/bipedalism.htm
Bipedalism was one of the first features to develop in our human ancestors. Is bipedalism better than being on all fours? Read more about bipedalism.
What is the Longest Time Someone Has Gone Without Sleep?
science.howstuffworks.com/life/inside-the-mind/human-brain/sleep-deprivation.htm
A man in Cornwall, England, went 11 consecutive days without a wink of sleep. Find out how he did it, why he did it and why you shouldn't give it a try.
Is there a link between concussions and dementia?
health.howstuffworks.com/mental-health/dementia/concussions-and-dementia.htm
Are concussions and dementia related? The cases of Chris Benoit and several NFL players point to yes. Learn about the link between concussions and dementia.
How Often Are Septic Tanks Emptied, and Where Do the Contents Go?
home.howstuffworks.com/home-improvement/plumbing/septic-tank-cleaning.htm
A septic tank requires a good cleaning to flush out sludge and scum, which don't drain like effluent. Learn how a septic tank cleaning works.
How Diesel Engines Work
auto.howstuffworks.com/diesel.htm
Diesel engines are often more efficient and less expensive to operate than their gasoline alternatives. So why aren't there more diesels on the roads? Well, they have their own issues, too.
How to Make Paper Masks
lifestyle.howstuffworks.com/crafts/paper-crafts/paper-masks.htm
Create paper masks for kids that can be worn or displayed as works of art. Kids will love these creations. Find out more about making paper masks.
Party Activities for Kids
lifestyle.howstuffworks.com/crafts/home-crafts/party-activities-for-kids.htm
Whether it's a party of one or of many, there are plenty of party activities for kids to do. Learn more about how to create party activities for kids.
Cinco de Mayo Crafts
lifestyle.howstuffworks.com/crafts/holiday-crafts/cinco-de-mayo-crafts.htm
Cinco de Mayo is a traditional Mexican holiday that is becoming increasingly popular in the U.S. Learn how to make Cinco de Mayo crafts for kids.
1946 Beechcraft Plainsman Concept Car
auto.howstuffworks.com/1946-beechcraft-plainsman-concept-car.htm
The 1946 Beechcraft Plainsman concept car was an airplane maker's ugly folly. See a profile and pictures of the 1946 Beechraft Plainsman concept car.