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Your search for "safe" returned 4,260 results
What's with China and lead poisoning?
health.howstuffworks.com/wellness/preventive-care/china-lead-poisoning.htm
Lead poisoning in China is a major problem across the country because of pollution. Learn about the 2007 toy recall due to lead poisoning in China.
Tsar Bomba: The Most Powerful Nuclear Weapon Ever Built
science.howstuffworks.com/tsar-bomba.htm
In 1961, the Soviet Union detonated the Tsar Bomba, still the biggest, most powerful nuclear bomb ever built. One of the cameramen who recorded the event said it sounded "as if the Earth has been killed."
What Is the Origin of Father's Day?
people.howstuffworks.com/culture-traditions/holidays-other/origin-of-fathers-day.htm
Are you wondering what's the origin of Father's Day? Check out this article and learn all about the origin of Father's Day and more.
How to Conserve Energy at Home
home.howstuffworks.com/green-living/how-to-conserve-energy-at-home.htm
What is "energy"? Where does it come from? How do we pay for it? Learn the answers to these questions, and find out how to live more efficiently in your home.
How Helicopters Work
science.howstuffworks.com/transport/flight/modern/helicopter.htm
Believe it or not, the marvel we know as the helicopter began as a Chinese top consisting of a shaft - a stick - adorned with feathers on one end.
10 Major Players in the Private Sector Space Race
science.howstuffworks.com/10-major-players-in-private-sector-space-race.htm
Sure, the shuttles may be sitting around in museums now, but our journey to space is far from over. Get ready to meet some serious contenders in the new space race.
How to Stimulate a Child's Mind
lifestyle.howstuffworks.com/family/parenting/parenting-tips/how-to-stimulate-a-childs-mind.htm
If you stimulate a child's mind, he or she will grow up to be engaged and excited about the world. Learn how to bring out the best in a child.
How a Circuit Breaker Works
electronics.howstuffworks.com/circuit-breaker.htm
Circuit breakers are an essential safety component in any home electrical system. Learn about home circuit breakers and breaker design.
How C-4 Works
science.howstuffworks.com/c-4.htm
C-4 is a powerful explosive that's used in terrorist attacks all over the world. Find out what C-4 explosives are and what C-4 explosives can do.
What is the difference between a hardwood and a softwood?
science.howstuffworks.com/life/genetic/question598.htm
What is the difference between a hardwood and a softwood? How hard does a tree have to be to be considered hardwood?