Saturday Tweets: Cheap Heaters, Paper Airplanes and Lost Ornaments
Solar-OSE: Solar concentrator for steam generation https://t.co/bj8QmXxG6t — Root Simple (@rootsimple) November 6, 2015 Cheapest Heater In The World Version 2. Bigger, Better, Hotter . https://t.co/bTmzTutTWX — Root Simple (@rootsimple) November 6, 2015 Citizen Maths: free/open adult math education for practical real-world numeracy https://t.co/n4IvJEytGn — Root Simple (@rootsimple) November 3, 2015 Gorgeous book of paper airplanes collected by a...