I always enjoy hearing from readers whether with general comments, specific ways I could improve the book, or questions related to the book’s subject matter. Since this book is being published in its entirety online, it is possible for me to reprint at least the online edition much faster than can be done with a traditional paper book. Thus corrections and errata are especially helpful since there’s a real chance for me to fix them. Before sending in a correction, please do check the online edition to see if I already know about and have fixed the problem.

Please send all comments, inquiries, bouquets, and brickbats to elharo@metalab.unc.edu. I get a lot of e-mail, so I can’t promise to answer them all; but I do try. It’s helpful if you use a subject line that clearly identifies yourself as a reader of this book. Otherwise, your message may get accidentally misidentified as spam I don't want or bulk mail I don’t have time to read and get dropped in the bit bucket before I see it. Also, please make absolutely sure that your message uses the correct Reply-to address and that the address will be valid for at least several months after you send the message. There’s nothing quite so annoying as taking an hour or more to compose a detailed response to an interesting question, only to have it bounce because the reader sent the e-mail from a public terminal or changed their ISP. But please do write to me. I want to hear from you.