We can cry out of sadness, fear, frustration, anger, or even joy. But why do streams of liquid leave our eyes? The truth is no one really knows for sure. In a scientific sense, we’re the only organisms who tear …
At the University of Chicago in the early 1920s, psychology grad student William Blatz built a remote-controlled trick chair that would collapse when he pressed a switch. (It was padded to avoid injury.) Then he had subjects sit in the …
