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).
Repairs and Retrievals. While in space, NASA astronauts often must handle a variety of repairs on highly sophisticated equipment. Mission specialists receive training in the area of equipment operations so that they will be prepared to make repairs in space to spacecraft, including to space stations.