Going to the bathroom can be controversial these days.

Photo by Kinky Boots/Facebook.

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4 women at NASA are currently training to become the first to walk on Mars.

NASA's class of 2013 might just have what it takes to visit the red planet and make history.

Astronauts are dreamers.

Astronauts look up to the stars and say, "I want to go there." Not metaphorically either, like a grandparent or graduation speaker might imply. They literally want to go up there and look around. Luckily for those dreamers, if they work hard enough they actually can do it.

But let's be clear. It's hard to be an astronaut. Really hard.

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Heroes