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).
From 1963 to 1975, NASA tested a group of lifting bodies. The characteristics of these winged research vehicles led to the development of the space shuttle. Image to right: The components of the Space Shuttle system: Orbiter, External Tank, and Solid Rocket Boosters. Today's space shuttle is a unique spacecraft system.