www.engadget.com - 2 years ago

ICYMI: Giant air purifier, true invisibility cloak and more

519091565c570411.jpg Today on In Case You Missed It: A 23-foot tall HEPA filter that looks like a building is running in Rotterdam, costing $1,000 a year to operate while cleaning up to 1 million cubic feet of air per hour. Scientists at UC Berkeley have hit on the tec...
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