Things, a lot of them software, that I found interesting. Everything I link to is free/open source unless specified otherwise.
Your 1868 guide on how to transfer linear motion to rotary motion, pulleys, gears, and so on. Many have animations.
http://507movements.com
Great for expats. Allows you to temporarily rent a US phone number -- an actual one, not a VoIP one, so you can receive sms - a txt message...
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