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Thing Explainer | xkcd http://blog.xkcd.com/2015/05/13/new-book-thing-explainer/

"Thing Explainer cover all kinds of neat stuff—including computer buildings (datacenters), the flat rocks we live on (tectonic plates), the stuff you use to steer a plane (airliner cockpit controls), and the little bags of water you’re made of (cells)."

Ron Baalke on Twitter: "50 years today (1965), Mariner 4 flew by & took the 1st closeup images of that planet. http://t.co/Tolu2DQnpm" https://twitter.com/RonBaalke/status/620952916480802816