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HowStuffWorks explores little-know facts about belly buttons, like why there is lint inside and why some people don't have a navel.

HowStuffWorks looks at eyebrow shapes throughout history and the celebrities who pioneered the looks from Marlene Dietrich to Cara Delevingne.

Activated charcoal is popping up everywhere. HowStuffWorks takes a look at the pros and cons of eating the black stuff.

Some people's sleep cycles are simply out of tune with the rest of the world. HowStuffWorks looks at the science of insomnia.

HowStuffWorks talks about some of the things health insurance doesn't usually cover in the U.S., like hearing aids, LASIK and infertility treatments.

Scientists have discovered what they are calling a new organ. HowStuffWorks takes a look at the science.

HowStuffWorks looks at whether LASIK surgery lasts a lifetime or if you sometimes need a touch-up procedure or have to start wearing glasses again.

Jog or sports bras are supposed to be snug to adequately support the breasts. Learn more about the right fit for jog bras at HowStuffWorks.

Off-label drugs are prescribed to treat conditions they're not approved to treat. HowStuffWorks looks at five of the most common off-label drugs.

There's growing evidence that sound can cause a range of health problems. HowStuffWorks looks at the science.

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