I have skimmed Head First Physics. It is fantastic, but it has nothing on electricity and magnetism. Do you plan to do a Head First on this. If not, won't you please do so.
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Unfortunately, there aren't any plans for a "next" Physics book. Right now, we're keeping an eye on how our existing math and science books are doing (Algebra, Statistics, Physics), and waiting to see if they're well-received. We're also trying to put some effective marketing behind them, as people in the non-technical fields aren't that aware of our Head First books yet.
Certainly, if the market really responds well, we'll be able to push further into math and science, and a second Physics book would then make sense. For now, though, you can literally affect the chances of a second Physics book by letting people know about Head First Physics (and our other math and science titles). It's really true: the more people that buy the existing titles, the more future titles we can confidently publish.
Series Editor, Head First