The office cubicle was invented by Robert Propst in 1968. His original design was called the Action Office System and provided “a social kind of privacy” for the worker.

The original word for “bear” has been lost. Medieval people thought that saying the ferocious animal’s name would summon it, so they used a euphemism that meant “the brown one” (“bear”).

In 2003, Leonardo Da Vinci’s machines were built and tested according to his original designs for a documentary. Some were successful and others proved to be impractical.