In preparation for deployment in Afghanistan, tests were recently carried out in which two Global Hawks were simultaneously controlled from one ground station.

ECONOMIST: Unmanned aircraft

That means Mars-bound astronauts will also have to skip out on the ground-based psychological support sessions that astronauts and cosmonauts working on the international space station routinely have just to make sure microgravity has not gone to their heads (Before Soviet cosmonaut Yuri Gagarin became the first man in space in 1961, experts were afraid weightlessness might cause schizophrenia, explained one doctor).

CNN: Mars on the brain? Red Planet pioneers to face cosmic mind trip