Some kids are hawking a new line of button-ups they claim can endure 100 wears (unwashed) and come out looking and smelling like new. So what's the big, scientific secret?

What if washing your favorite T-shirt didn't require any washing whatsoever? Well, guess what. Science says it's possible. Chemical engineers in China say they've developed a cotton fabric that cleans itself — all it needs is a little sunlight.