In the last year, at least 90,000 students have used Astronomy, the 
free, open-source astronomy textbook published by OpenStax, a 
non-profit project at Rice University. (We say at least, since we only 
have information about registers adopters, and some people are using 
all or part of the book without the optional registration. Registered 
adopters get access to answers to the questions in the book and other 
materials for instructors.) For access to the book, which some 70 of 
your colleagues helped update and review, go to:

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