Maritime Morse code was formally phased out in 1999, but in California, a group of enthusiasts who call themselves the “radio squirrels” keeps the tradition alive.

Morse Code Day is April 27, 2018. Learn how the electric telegraph revolutionized how quickly messages could be received.

Now Morse code is used largely in airplane navigational systems for identification purposes, says Paul F. Johnston, curator of maritime history at the National Museum of American History.

Matt Largey profiles one of radio's unsung pioneers, marking the centennial of the first voice broadcast. On Dec. 24, 1906, Morse code gave way to the human voice and a Handel piece heard by ...

However, with Morse code, some things are very short (like an E, for example) and some are much longer (like a zero). In fact, the code tries to reflect the frequency certain letters occur.