Morse code

"I decoded Morse code and passed it to the next person," she said.

According to Hal Whitehead, who has pioneered research on social organization and cultural transmission in deep-water whales since the 1970s, researchers began studying sperm whale codas by comparing them to Morse code.

To get a reward, mice had to learn to distinguish between patterns of an odor stimulus that had variable timing, as if they were learning a very simple form of Morse code.

He became an expert in Morse code and participated in war missions in Iran, Ukraine and England before his service ended in 1945.

After starting his Army career in Omagh, County Tyrone, he moved to England and worked for a time as a Morse code signaller.