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"Ask the Van" is part of the Physics Van outreach program at the Department of Physics at the University of Illinois. Our dedicated group of volunteers has been answering questions online since 1998. If you'd like to ask a question, please read our answering guidelines first - we try to answer as many questions as we can, but it's not always possible to answer them all.  You may also want to take a look at our note on the reliability of websites like ours or at our citation info.