John Murdock, who died February 16 at 87 at his home in Swarthmore, Pa., was a mechanical engineer who developed the countercurrent swimming machine and patented the CarTurn, a kind of lazy susan for ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." For some, a backyard pool is the ultimate at-home amenity. However, not all pools are created equal.

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