Elon Musk: "I would like to die on Mars"
Given Mars' weak gravitational field, extremely low atmospheric pressure, lack of breathable oxygen, deathly cold temperatures, and weak magnetic field (leading to high levels of radiation), he may well get his wish.  Many others will likely get this wish against their will.<p>If he would like to get a taste of realistic Martian colonization here on Earth, may I suggest living underground in a windowless tank, surrounded by a partial vacuum, next to a nuclear reactor.