Astronaut David Wolf and the crew of the space shuttle Endeavor answered some questions from kids and teens posted on YouTube.
Wolf responded to one kid who wanted to how do you sneeze in a space suit?
Wolf says he's done it quite a few times, including during a space walk this week.
He says you have to -- quote -- aim well.
Wolf notes that if you sneeze all over the inside of your space helmet there's no way to clear the view.
Endeavour is on a 16-day mission to the international space station.
NASA plans to have Wolf take part in another space walk today.