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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
	colossal	Dec 01, 2014
	How to Build the World’s Simplest Electric Train ⌘ http://www.thisiscolossal.com/?p=50214 #batteries #design #electricity #magnets #science