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Joe Smith

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Remove 7 letters from this sequence (DIESTRUCSKTALIONOO) to reveal a familiar English word.
MATH PUZZLE: Can you replace the question mark with a number?
I am both a killer and a savior, it depends on those who wield me. I will bring you from deep water to the shallows, or maybe I could be the one who will hang you in the gallows. What am I?

Jean(-Rodolphe) Perronet

Died 27 Feb 1794 at age 85 (born 8 Oct 1708).Jean-Rodolphe Perronet was a French civil engineer who was renowned for his stone-arch bridges, especially the Pont de la Concorde, Paris. During construction of a bridge at Mantes in 1763, Perronet made the discovery that the horizontal thrust of a series of elliptical arches was passed along to the abutments at the ends of the bridge. Thus he was able to build extremely flat arches that were supported during construction by timbering (falsework) and mounted on very slender piers, which widened the waterway for navigation and reduced scour from the current.

Mark Gross: Can You Help?

A couple days ago, I was crossing this bridge, and there was this character standing there with a cup in his hand. He goes, Hey, can you help out my wife and family? I said, Sure. And I pushed him off the bridge.
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