Not sure this belongs here or in the announcements (help me out, admins!) but rather unexpectedly, on 11/12/09 I've got Marcus Chown, popular science author of We Need To Talk About Kelvin, guest blogging at my blogsite.

Basically, he's agreed to answer science questions from people writing SF, and the idea is if you've got a plot issue or setpiece that's bugging you as it pertains to any sort of science, or you ever wondered what would happen if a certain scenario came true, here's your chance to get a second opinion.

You could post a question here or on my site and I'll put it to him and get an answer for you.