Did you ever wonder who invented something, and when it was invented? Go to this interactive timeline that highlights inventors/inventions from 1750-1990. Click on the topic to read a brief paragraph about that invention.

The Saturday afternoon before Christmas in 1984, on a New York City subway car making its run downtown, two black teenagers approached Bernhard Goetz. One of the teens said to the slightly built blond man, "Give me five dollars." Seconds...

Spray-painted subway cars, tagged bridges, mural-covered walls- graffiti pops up boldly throughout our cities. And it turns out: it's nothing new. Graffiti has been around for thousands of years. And across that span of time, it's raised...