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How do you wash your hair in zero-gravity?

MEGAN MCARTHUR, NASA ASTRONAUT:

"I'm going to go ahead and put some of this no rinse shampoo. And then I go ahead and I rub it in a little bit, just like you would on Earth. Rub that in."

The first all-civilian spaceflight crew is preparing for take-off

The upcoming SpaceX launch includes a billionaire, engineer and professor

NASA astronaut Megan McArthur

shares her tips for space tourists

MEGAN MCARTHUR, ON EATING IN SPACE:

"All of the liquid that's in those (food) packets, you know, if you are eating too fast and you get some of that liquid airborne, it's going to go everywhere. It's going to get on your crew mates. You're going to find it a week later, you know, by the duct work or something. Every little thing that you take for granted on Earth when all your stuff stays put is a little more challenging in space."

Their mission will last three days

MARK VANDE HEI, NASA ASTRONAUT: "Most of us have experienced what it feels like to be on a roller coaster, and that moment when you're strapped down in a roller coaster and it kind of goes at high speed over the top of a bump and you rise up in the seat: That's what it felt like to me."

They blast off on September 15