It was the only technological tool widely and continuously used for over three centuries. For math and science geeks it was a badge of honor, nestled neatly into a plastic pocket protector along with ...

The protractor and the Bunsen burner. Playing the recorder in music class. Drawing arcs and circles with a compass in geometry. These tools of the education trade become part of our lives for a ...

Learning something on YouTube seems kind of modern. But if you are watching a 1957 instructional film about slide rules, it also seems old-fashioned. But Encyclopædia Britannica has a complete ...