NASA workers donate 30 litres of urine each day to space program contractor Hamilton Sundstrand.
No, not for drug testing.
The urine collection caper is a long standing NASE tradition for use in the design of better space toilets.
According to someone who must have intimate knowledge of these things:
Urine is a mess because urine is full of solids. Those solids clog the venting system for dumping pee, making it a challenge to keep the disposal system clear.
NASA workers: giving that little bit extra.