Hopefully many of you have been following our Science Off The Sphere series of videos on PhysicsCentral. If you have, you know Don Pettit is a pretty cool guy. He does really cool demos and even offers dating advice from time to time. This Friday, Don will be interviewed on NASA TV and he wants to answer some questions from you. If you have a question you've always wanted to ask Don, anything from where did you learn to play the didgeridoo to where did you get cornstarch in space, put your question in the comments section below. If you'd rather let us know your question directly, send an email through our website.