Trivia / Knowledge

What did Kepler know about vision?

Among his many achievements, the astronomer Johannes Kepler chalked up one about man's inner world. It was Kepler who realized that man's visual apparatus is so constructed that it can produce only inverted images.

Who invented the automobile?

Henry Ford did not invent the automobile. It was the invention of several 19th-century engineers, paramount among them being two Germans: Gottlieb Daimler and Karl Benz. What Ford did accomplish was to mass-produce automobiles and provide ...

How fast does a rocket need to go?

A space vehicle must move at a rate of at least 7 miles per second to escape Earth's gravitational pull. This is equivalent to going from New York to Philadelphia in about 20 seconds.

When did we find the first pulsar?

The first pulsar (a celestial object that emits brief, sharp pulses of radio waves instead of the steady radiation associated with other natural sources), discovered in 1967, never varies in its timing by even as much as a hundred-millionth of a ...