Mars

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At age 86, living legend Dr. Buzz Aldrin was recently medically evacuated from the South Pole. In the first of a two-part series, Dr. Jamie Wells shares an experience she had at high elevation with the former astronaut when addressing altitude illnesses, prevention and treatment.  
Can We Make it to Mars?
According to SpaceX, more than 200,000 people from around the world want  to be the first to travel to Mars. But the rocket maker cautions that (1) this isn't a Moon quickie; the trip will take roughly six months; and (2) the company has no plans to bring its astronauts back to Earth ... ever. That danger aside, reportedly there are 100 finalists vying for a shot at blasting off for the Red Planet.