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This generator uses the Flickr API to retrieve images determined by parameters you specify and returns an RSS feed, whose URL you can paste into the screensaver options screen in OS X. Works on a PC too!

"From the smartphone Annie Leibovitzes to the Instagram Ansel Adams, it seems that everybody is a photographer these days. This is a fact teachers can and should take advantage of in the classroom - and for many reasons more than to expand the student photo repertoire beyond the selfie (though that is certainly an admirable goal). While a good lesson in photography itself is a fruitful place to start, digital photography can be a launching point for lessons in writing creatively, thinking critically, expanding the student worldview and building empathy that extends far outside the classroom. Let's take a look at a few of the best photo sites out there today and discuss a number of ways you can make the most of them in your classroom."

"When Ernest Hemingway would stand at his desk, he had a funny habit as he wrote: when he was working on the tough bits he'd write in his boyish, punctuation-disregarding longhand. Once the juice started to flow, he'd switch to the typewriter. Hemingway was moving between unmediated and mediated work: the pencil to his page was unmediated, the typewriter mediated. The analog helped to find flow, the mediated helped find efficiency. As Clive Thompson, the author of Smarter Than You Think: How Technology Is Changing Our Minds for the Better, would argue, working in analog or mediated ways changes how our brains and thoughts behave: anyone who's ever received a serendipitous answer from someone on Twitter has experienced how technology can amplify our social thinking, while at the same time if you've put off your projects because you're fiddling on Facebook, you know much tech can distract us--to the point of changing the structure of our brains."