Expedition 12 was a mission to the International Space Station (ISS) that took place from October 2006 to April 2007. The crew consisted of NASA astronaut Bill McArthur and Russian cosmonaut Valery Tokarev. They conducted scientific research and maintenance tasks aboard the ISS during their six-month stay. The mission focused on various experiments in fields such as biology, physics, and technology. The crew also participated in spacewalks to upgrade the station's systems and equipment. Overall, Expedition 12 contributed to the ongoing development and operation of the ISS, enhancing our understanding of living and working in space.