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    • What Was the Deepest Free Dive Ever Recorded?

      HowStuffWorks via Yahoo Canada Sports· 2 hours ago

      Free diving is a breathtaking sport, literally and figuratively, requiring athletes dive to astonishing depths (recorded primarily in meters) on a single breath of air. Instead of using scuba ...

    • Why did railroads use train orders? - Trains

      Why did railroads use train orders? - Trains

      Trains.com· 4 hours ago

      If you’ve read Model Railroader or many of our books and special issues, you’ve probably seen references to timetable-and-train-order operation, or TTTO...