Professor John Mainstone, the longtime custodian of the University of Queensland’s famous Pitch Drop experiment, has died after suffering a stroke.
For more than 50 years, Professor Mainstone monitored dripping tar from a glass funnel sitting in the lobby of the university’s physics department.
The experiment began in 1930 as a way for the late Professor Thomas Parnell to prove the liquid nature of a solid object at room temperature.
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No-one, including Professor Mainstone who began his vigil in 1961, has ever seen a drop fall.