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 studies astronaut twins to observe the rigors of space. NASA and GM's Robonaut2 allows human astronauts to feel the fear of obsolescence (video) About a decade ago, two of our favorite government entities, NASA and DARPA, paired off to create the robotic astronaut of the future: Robonaut. He had a cool copper helmet and some faux-muscly arms, but ultimately never made it to space.