A 1988(!) paper on the failure of educators to use the spacing effect: http://andrewvs.blogs.com/usu/files/the_spacing_effect.pdf … Interesting because:pic.twitter.com/ByvoRfIPWw
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
(b) it would likely be easy to modify classrooms to use it, and it would likely make an enormous difference to education; and
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.