@MForstater here it is http://www.wired.co.uk/news/archive/2015-09/23/micromotors-help-combat-carbon-dioxide-levels … just use these little critters as basis of calcium carbonate 3D printer
I know a lot goes into working out smart Qs for XPrize. But this seems like call for a perpetual motion machine?https://twitter.com/GRI_LSE/status/648856512564228096 …
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@CarterPaddy - as long as you've got a free supply of platinum...
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