In 1836, Samuel Morse, Joseph Henry, and Alfred Vail developed the telegraph, a system that sends electrical pulses along a wire over long distances.
Since then, Morse code has been used for all sorts of communications over the telegraph, through casual tapping in every spy movie, and by flashing lights on ships.
Morse Code Day is celebrated every year on Samuel Morse’s birthday.
Here’s an ancient S.O.S.:
“In my distress I called to the LORD;
I cried to my God for help.
From his temple he heard my voice;
my cry came before him, into his ears.”