It's not all space walks and floating through the heavens on the International Space Station. There's time for fun, too.
Did you ever wonder what water looks like in zero gravity? NASA astronaut Don Pettit plays around with these "astro puffs," and the result is mesmerizing water like you've never seen it—and water that Pettit has big plans for after.
Skip ahead to 1:45 to learn why simple, but fun experiments like this can reveal new frontiers.