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Are humans built to drink milk as adults? Find out why most adults around the world can't drink milk at HowStuffWorks.

How much dirt do I eat in a year? More than you might think. Can dirt help keep us healthy? Find out at HowStuffWorks.

Is fast food addictive? What's the science behind those cravings? Find out at HowStuffWorks.

Some people say that wheat has compounds in it that make it addictive. But is this true? Find out if wheat is toxic at HowStuffWorks.

Pulled an all-nighter last night? You're a danger to yourself and others. Find out why sleep deprivation is such a hazard.

Can swishing oil around in your mouth for 20 minutes net health benefits? Find out why some people swear by oil pulling.

Some diseases used to kill millions of people, but not any longer. Learn about 10 diseases that used to be death sentences from HowStuffWorks.

Some supplements are touted as miracle cures, and while they may have benefits, they don't live up to the hype. Find out about 10 such supplements.

Elevators give many people anxiety. So how does elevator psychology, or treating people who are scared of elevators, work? Find out at HowStuffWorks.

What are the 10 hardest habits to break? Find out about the 10 hardest habits at HowStuffWorks.