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Some flash mobs are so wild you can hardly believe they happened. Check out 5 mind-blowing flash mobs at HowStuffWorks.

Learn more about five ways to donate your old cell phone or smartphone to charities that recycle or refurbish old phones.

Can you really lose 6 to 10 pounds in a week on the Mayo Clinic Diet? See how the Mayo Clinic Diet works and the food limitations involved.

The P90X diet goes along with the P90X workout. See the pros and cons of the P90X diet at HowStuffWorks.

Is China taking over the world or are they just trying to gain a better foothold in the world? Find out if China is taking over the world.

Unusual ER visits can be hilarious after the danger has passed. See these five unusual ER visits for some crazy tales.

Estimating the cost of utilities can help you manage your budget. Visit TLC Family to learn about estimating the cost of utilities.

What are CO2 dragsters? Read about CO2 dragsters and CO2 drag racing at HowStuffWorks Auto.

Testing vehicle stopping time requires some math. Visit HowStuffWorks to learn about testing vehicle stopping time.

Mortgage co-signing can be tricky. Learn about how mortgage co-signing works at HowStuffWorks.

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