Beginning this Thursday, a Simon Fraser University professor will spend the rest of his summer vacation rehearsing the trip of a lifetime: a manned mission to Mars. If all goes well, Steve Braham and five others will be the first Martian enthusiasts to spend eight weeks living inside a two-storey metallic cylinder — resembling two huge tuna-fish cans stacked one on top of the other — built on the lip of a giant crater in Canada’s barren arctic. “Some people think I’m thoroughly crazy,” said Braham before he left for Canada’s high arctic last week. “The question is usually, ‘Why?'” It’s all part of a project jointly engineered by NASA, the SETI Institute, and the Mars Society, which attempts to simulate the experience of living on Mars.