I don't know if I can fully define human nature, but I'm pretty sure it includes a prurient and/or practical interest in how one uses the bathroom under strange circumstances. Thus, the various videos you've seen over the years explaining how astronauts use the toilet on board the Space Shuttle and the International Space Station. Until a recent visit to Seattle's Museum of Flight, however, I'd never seen how cosmonauts do their business — an issue with increasingly broad reach, now that Americans and other international space voyagers are being ferried into the heavens aboard Soyuz.
The Soyuz toilet does not look much like the ones on board the Shuttle or the ISS. Those are recognizably toilets, for one thing. The Soyuz sanitary unit is more akin to peeing into a soda bottle in the back seat of the family station wagon — if that soda bottle were hooked up to a vacuum cleaner.
This video — kindly shared with us by The Museum of Flight — was filmed in 2009 by NASA astronaut Michael Barratt. It features the urination demonstration talents of spaceflight adventurer Charles Simonyi and Russian cosmonaut Gennady Padalka. Please note that this video only demonstrates how the "part Number 1" works — and even that really only seems to apply to gentlemen cosmonauts. As best I can tell, women apparently just pee into something akin to a compact diaper or sanitary pad. (Fun!) As for "part Number 2", here is how it was described in a 2007 NASA publication written by James Lee Broyan, Jr.:
For fecal collection, a porous bag is placed in the receptacle. Once defecation is complete, the bag is removed, placed sequentially in three bags, and then placed in a wet trash compartment. Based on personal conversations with АСУ trainers, urine collection is acceptable but fecal use is avoided if at all possible with the crew using diet restrictions and preventive measures prior to flight.
• Read the 2007 NASA publication comparing different space toilet systems. Apparently, part Number 2 has also been used by female cosmonauts to dispose of menstrual waste.
• Read a description on the RuSpace site, which gives a little more detail on part Number 2.
• Watch the video at YouTube
Thanks to Ted Huetter at The Museum of Flight!