Pitch is a very tough substance, used to waterproof boats and traditional burning torches. At room temperature you can shatter it with a hammer. The black substance, so dark that it is the source of the term ‘pitch-black’, seemed to be a solid at room temperature; Professor Thomas Parnell disagreed, and set up one of the longest science experiments ever, to prove his point. This became known a the ‘Pitch Drop Experiment.’
The preparation itself took years, in 1927 he prepared a sample in a sealed funnel, then heated it. Three years later it had cooled and settled down. In 1930 the bottom of the funnel was cut, giving the pitch free sway to plummet downwards under the effects of gravity. So began one of the slowest drips the world has ever witnessed. Each drop takes between eight and nine years to form, but form and fall they did. Professor Thomas Parnell only ever lived past two drops of pitch before his death in 1948. The experiment continued without him.