Before the 20th century, concert musicians might tune their instruments to wildly different pitches, depending on where they were playing.

BIG QUESTIONS
And why do they have to be so loud?
According to the U.S. Flag Code, you shouldn’t let the flag touch the ground or hang it upside-down. While there’s no express prohibition about reversing the image, it’s probably a safe bet you shouldn’t do that, either.
Don't blame the government if you're unhappy with a speed limit—blame your fellow drivers.
It starts in the brain.
... and your other burning, pencil-related questions answered.
The City That Never Sleeps has lots of nicknames, but this one might be the most ubiquitous.
Getting on the guest list for any royal affair is no easy feat, but this list is even more exclusive than most.
There would be no royal wedding this month without an important statement from Queen Elizabeth.