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According to NASA, Mike is going to answer questions for from 4-5pm ET via Ustream's Twitter chat on topics such as his return home flight, his experience repairing the Hubble Space Telescope. Ask a question on Twitter, and @astro_mike could well answer it.
We've known for a while that NASA has been a huge proponent of the connective power of social media, and this live Q&A is another great step to connecting people with the U.S. space program and its heroes. And heck, who doesn't have a question about working and living in space?!
If you're interested, we've embedded the live video below. If you ask a question via Twitter chat, be sure to let us know your question and Mike's answer in the comments: