Savage-Rumbaugh and her colleagues kept adding symbols to Kanzi’s keyboard and laminated sheets of paper. First Kanzi used 6 symbols, then 18, finally 348. The symbols refer to familiar objects ...

Although the first documented use of @ was in 1536, the symbol did not rise from modern obscurity until 1971. Illustration by Erik Marinovich Called the “snail” by Italians and the “monkey ...