Depression may be challenging to assess in a patient with dementia. In patients with AD, the presence of depression may range from 6% to 30%, depending on the diagnostic criteria employed (Cummings et al., 1995). The prevalence and course of depression in dementia are controversial, due to several confounding factors.
Astronauts use space shuttles(trasport people and equipment), Space probes (robotic exploration, Spacecrafts (trasport crew, equipment, and other technologies).
NASA used the pool to train astronauts to build the international space station, and it held mockups of both the station and the space shuttle. The agency still uses the pool but at about 60 percent of the level it did during construction of the station, Paul Hill, director of mission operations, said.