Beef barons needed cowboys less and bookkeepers more as the nineteenth century wore on.

Puzzles, or “dissected maps,” were invented in Georgian-era England, probably by a mapmaker named John Spilsbury in the early 1760s.

During the Cold War, America's libraries helped patrons prepare for nuclear war, from stocking reference materials to providing fallout shelters.

The internet has already transformed how Americans eat; the Amazon/Whole Foods deal is just the culmination of this transformation.