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).
Manned Space Robots. A manned spacecraft carries Astronauts to space. Unlike an unmanned probe, the manned spacecraft consists of a crew compartment and life support systems. This type of spacecraft can either be reused as in the case of Space Shuttle or designed for one-time use as in Soyuz.