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Some strange pregnancies have occurred, including a pregnant man. Take a look at this list of five strange pregnancies to learn more.

Gender reassignment usually involves hormone treatments and surgery. Learn about the stages of gender reassignment at HowStuffWorks.

Can you truly become physically dependent on chocolate? Find out if science supports the claims of chocolate addiction.

An unselfish act is an act in which one person benefits while the person performing the act gains nothing. Find out if an unselfish act is possible.

Do birds of a feather flock together? When it comes to marriage they often do. Check it out just how similar are spouses at HowStuffWorks.

What do women find attractive about a man's smell? Visit Discovery Health to learn what women find attractive about a man's smell.

Everyone's familiar with the green-eyed monster called jealousy. But why do people have those feelings?

The physical effects of stress go beyond what you might think. Headaches, diarrhea, backaches -- find out more about the physical effects of stress.

Mayors get a lot of exposure and have tons of responsibility. Visit HowStuffWorks to learn all about mayors.

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