Science
In 1927 a Brisbane physics professor melted a lump of tar and sealed it in a funnel, and almost a century later that tar, stiff enough to shatter under a hammer, has dripped only nine times
The pitch drop experiment at the University of Queensland is the world's longest-running laboratory experiment. The tar inside looks like a solid and breaks like hard toffee when struck, yet it has been quietly falling, one rare drop at a time, for nearly a hundred years.