For Flight Engineer Cynthia Han and her fellow astronauts aboard the International Space Station, Expedition 81 has proved as mundane as space travel ever gets. Yes, this would be Cynthia's final NASA mission, for reasons she's so far kept from the rest of the crew; and yes, the latest billionaire "space tourist" has managed to irritate everyone on board. Still, none of them could have asked for a smoother experience. Until the morning they...