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Q & A: Physics Questions? Ask the Van

Physics Questions? Ask the Van

Question of the Day

"What are the differences between green and red laser? Why is green more expensive than red?"
-michel vieira (age 18)

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8331 questions have been answered online since 1998 by volunteers from the Department of Physics at the University of Illinois' Physics Van outreach program. We've tried hard to make this the most reliable physics Q&A site on the Web, but no site is perfect, as we explain on this note. Our Baloney feature provides examples of how shaky many other sites are.

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Questions from kids are especially welcome!