The longest-running laboratory experiment in the world began at the University of Queensland in 1927, a funnel of pitch that drips roughly once a decade, and in nearly a century no human has ever actually witnessed a drop fall

Thomas Parnell set up the pitch drop experiment at the University of Queensland in 1927 to prove that a substance hard enough to shatter with a hammer is actually a fluid. Nine drops have fallen in 98 years, each one missed by every human observer. The post T…