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How Carbon Monoxide Detectors Work
home.howstuffworks.com/home-improvement/household-safety/carbon-monoxide-detector.htm
Carbon monoxide detectors help protect your family from deadly carbon monoxide gas. Find out how carbon monoxide detectors sense dangerous molecules.
How Is the National Guard Different from the U.S. Army?
science.howstuffworks.com/national-guard.htm
The National Guard serves many purposes and does many jobs for the United States. Learn what the National Guard is and how it differs from the Army.
How many sharks are killed recreationally each year -- and why?
animals.howstuffworks.com/fish/sharks/shark-fishing.htm
Shark fishing is endangering these saltwater fish that have been around longer than the dinosaurs. Learn why shark fishing has become such a threat.
10 Incredible Wind Power Facts
science.howstuffworks.com/environmental/green-science/10-wind-power-facts.htm
In the race to find alternative energy sources, wind power is a strong contender. In fact, it's already making its mark. How much do you know about this up-and-coming energy source?
What Are Haptics on iPhone Devices and Why Do They Exist?
electronics.howstuffworks.com/everyday-tech/haptic-technology.htm
Ever wonder how flat cell phone keys vibrate to let you know you've pressed a button? It's called haptics, and you can use it for lots more than just phones.
Ringling Bros. Retiring Elephants Early. PETA Still Not Smiling
All 11 of the circus's touring elephants are headed for a Florida retirement in May. Learn more about Ringling's elephants at HowStuffWorks Now.
What's the Difference Between a Cave and a Cavern?
science.howstuffworks.com/environmental/earth/geology/cave-cavern-difference.htm
One term might give you the impression of something grand and mysterious, while the other makes you think of claustrophobia-inducing environs that threaten human life. But what's the real difference?
Otis Carr
science.howstuffworks.com/space/aliens-ufos/otis-carr.htm
Otis Carr was a businessman and hoaxster who founded OTC Enterprises to build and sell a free-energy spaceship, the OTC-X1. Read more about Otis Carr.
5 Questions to Ask Before Donating to a Charity
money.howstuffworks.com/5-questions-to-ask-before-donating-to-charity.htm
How can you tell if a charity is actually effective? Is it better to give one big donation or several small ones? We look at five of the most-asked questions about charity giving.
How 4D Printing Works
science.howstuffworks.com/4d-printing.htm
Is 4D printing much different from 3-D printing? What if we told you some tech insiders are betting it has the potential to change industries from fashion to health care to defense?