Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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The NCHFP is an excellent source for information on safe canning practices -- and it's important to note that they have no recommendation for canning mashed potatoes, even in a pressure canner. Other dense purees like pumpkin and sweet potato, are expressly not recommended for canning, as the density can prevent adequate heat penetration to ensure safety. I would not can mashed potatoes under any circumstances.