The code uses a combination of short and long pulses – dots and dashes, respectively – that correspond to letters of the alphabet. The International Morse Code encodes the 26 letters of the ...

An 1877 print from Knight’s American Mechanical Dictionary offers a simple guide for sending letters and numbers in Morse code. Library of Congress Adam Kimmerly of Ramona, California ...

As they swim and hunt, these massive marine mammals communicate by making a series of rapid clicks that sound like a combination of “Morse code and popcorn popping,” writes NPR’s Lauren Sommer.