Now hear this: Drive-in movie theater speakers

The late 1950s and the early 1960s were the drive-in glory days, when there were about 4000 such venues spread across the country -- about a quarter of the total number of movie theatres.

Oh, the humanity: The Hindenburg disaster (1937)

The German airship took only a minute to burn, but that moment was enough to etch the image of that fiery Zeppelin onto the minds of millions around the world. Only 62 would survive the tragedy, and many of them were seriously injured.