30.04.2014 05:20 Uhr, Quelle: Engadget

​New York City is cleaning its ancient Egyptian monument with lasers

A 69-foot, 3,500-year old granite obelisk has stood in New York City's Central Park for 130 years, and it's never, ever, been cleaned. The ancient pillar is deceptively fragile, and conservationists have been hesitant simply to hose it down. The

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