The International Space Station is something of a problem child.
The orbital outpost is plagued by cracks, coolant and air leaks, even a surprising smell that recently wafted into the station from a just-arrived Russian Progress cargo ship. And the station has high-speed, close encounters with space junk from time to time that make the facility a risky residence. So, there's escalating worry that the aging complex has become a questionable home for crews to be safe and sound.
