Things I didn't know

Obviously not a short list, but some of these are mind blowing. For example, "If you properly shuffle a deck of cards, in all likelihood, the resulting deck has never been seen before in the history of the world."

ataussig On @Quora: What are some of the most mind-blowing facts? 159 Answers: qr.ae/7xuNPTue, Dec 20 07:30:22 from Quora retweeted by msuster

470 Amateur Radio Net Trivia

I learned a couple of things tonight during the trivia part of the 470 Amateur Radio Net.

Before there was SOS and Mayday, ham radio operators used "CQD" to indicate a distress call. "CQ" is used as general call for making a contact - appending the "D" indicated danger or distress.

Spark Gap Transmitters were used as digital communication before CW.