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The epic musical 'Grease' has turned 40. Think you're hopelessly devoted to the iconic film? Test your knowledge with this HowStuffWorks quiz.

Streaming TV shows online seems like it makes sense for the networks. So why aren't all shows available via the Internet?

Jerry Seinfeld loves Superman in his beloved self-titled sitcom, but is the superhero mentioned in every episode? Find out at HowStuffWorks.

Keeping up with toy recalls can help keep kids safe. But who decides when a toy is recalled? Find out at HowStuffWorks.

Sailors once considered women on ships bad luck. Find out why at HowStuffWorks.

Could holding your pee for a long time have serious consequences? Find out if holding your pee too long can cause your bladder to rupture.

What was the first circus? Learn how circuses got their start at HowStuffWorks.

Being healthy is about more than just being free of germs. Get some tips on how to maintain a healthy lifestyle -- from the inside out.

Headache exercises can help ease debilitating tension headaches. Learn about the source of this pain and headache exercises for relief.

Think you've got the right stuff to ace this boy band quiz? Take it and find out! We know you want it that way.

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