Concrete 'battery' now packs 10 times the power | Hacker News

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		Concrete 'battery' now packs 10 times the power (techxplore.com)
		4 points by PaulHoule 49 days ago \| hide \| past \| favorite \| 1 comment

abstractspoon 49 days ago [–]

10 times zero is still zero?

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