Harris remembered an Air Force instructor who had shown him a secret code based on a five-by-five alphabet matrix. Each letter was communicated by tapping two numbers: the first designated the ...

Of the many unsung heroes of World War II, the Navajo Code Talkers were perhaps the most overlooked. This group of Marines ...

are closer than ever to finding out by deciphering that language. Using AI to decode clicks from sperm whales, the scientists discovered a sophisticated alphabet hidden in the animals' sounds.

Once you have your circles, you need to write the alphabet around the outside ... This will let you make secret number codes later. Put the small circle with the letters on it on top of the ...