danspalding writes: "I'm an adult education teacher in SF who wrote an e-book about how to teach adults, called "How to Teach Adults." It will be available to download for free in January 2013. I Kickstarted enough money for editing, design and publicity, but not enough to pay me anything up front. I'm considering making a $1, $10 and $25 version available from Amazon as a way for folks to donate money to me, as well as a straight up PayPal link on my site. (Although I hate PayPal.) Is it possible to produce quality material for teachers to download for free in a way that's economically sustainable? Might readers accidentally pay for a copy without realizing there's a free download and get pissed off? And where should I host the free-to-download version?" Link to Original Source
"The fundamental principle of science, the definition almost, is this: the
sole test of the validity of any idea is experiment."
-- Richard P. Feynman