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From Discovery News Top Stories : Discovery Channel:

A NASA urine drive aims to help engineers design a new space toilet. Have a business meeting in Houston next week? Be a good American and drop by for quick pee break at 2200 Space Park near the Johnson Space Center. Yes, you read that right: NASA needs your urine. The drive is to benefit NASA's fledgling Orion Program, which aims to put astronauts back on the moon by 2020. The pee drive is to help engineers working on designing the new spaceship's toilet. Donations will be treated with a chemical that can hold solid particulates in the liquid so they don't clog up the tubing in microgravity, said Leo Makowski, company spokesman for Hamilton Sundstrand, a contractor designing the new spaceship's toilet. "This is a preliminary test to see if this chemical is going to work the same way as it did on the [space] shuttle," Makowski told Discovery News. It's difficult to come up with a faux urine, explained NASA's Jim Lewis, the systems manager overseeing development of Orion's potty. "That's why we depend on collections." First, a couple of ground rules: *Pure urine samples only -- no blood -- to assure personnel safety, according to a memo to employees obtained by NASAWatch. *Maximum contribution (per donation) -- 350 milliliters. "While this is not a regulation of our testing," notes the memo, "you are not encouraged to over-hydrate as this could dilute the urine we collect."

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