The first message sent by Morse code’s dots and dashes across a long distance traveled from Washington, D.C. to Baltimore on Friday, May 24, 1844—175 years ago. It signaled the first time in human history that complex thoughts could be communicated at long distances almost instantaneously. Until then, people had to have face-to-face conversations; send coded messages through drums, smoke signals, and semaphore systems; or read printed words.

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