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How Leprosy Works

 How Leprosy Works

There are many myths and stigmas associated with leprosy, almost all completely incorrect. It's not a very contagious disease, and it's easily treatable. What else is wrong in the common beliefs about Hansen's disease? See more »

Who was the fifth Beatle?

 Who was the fifth Beatle?

John, Paul, George and Ringo were the Fab Four of The Beatles – or did they have a fifth member? Legend hints there was one, but who was he? See more »

Were U.S. interstates really designed as runways?

 Were U.S. interstates really designed as runways?

Is one mile out of five on U.S. interstates really supposed to be straight so that planes can land on them in an emergency? Read on to find out the truth about this long-held urban legend. See more »

How Itches Work

 How Itches Work

Although everyone itches, the reasoning behind it has puzzled scientists for decades. They're also trying to figure out why scratching an itch relieves it — and feels so good. See more »

How Thermal Imaging Works

 How Thermal Imaging Works

Thermographic cameras detect infrared light (or heat) invisible to the human eye. How can the camera's sensors register temperature at a distance, and how can the tech be used? See more »

Is urine really sterile?

 Is urine really sterile?

"Pee on it" has long been the advice for a jellyfish sting or even a regular cut if nothing else is available. But is this really the best advice? See more »