Undersea Habitat Becomes Experimental Space Hospital NASA -- The days of doctors making house calls may seem like ancient history for most patients in North America, but in October, three astronauts and a Canadian doctor will test the latest concepts in long-distance house calls using a unique underwater laboratory.     The ability to conduct long-distance health care such as telemonitoring and telerobotic surgery could be key to maintaining the wellness of future spacefarers and responding to medical emergencies on the International Space Station, the moon or Mars...