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colossal | Jul 27, 2015 |
This Portable Salt-Powered Lamp Stays Illuminated for 8 Hours on a Glass of Seawater ⌘ http://www.thisiscolossal.com/?p=58494 #batteries | ||
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colossal | Dec 01, 2014 |
How to Build the World’s Simplest Electric Train ⌘ http://www.thisiscolossal.com/?p=50214 #batteries #design #electricity #magnets #science |