Hidden in plain sight in the Parnell Building at the University of Queensland, Australia, sits the world's oldest continually running experiment*. Inside a plain glass display case, sits an innocuous bell jar, which in turn houses an equally nondescript funnel filled with a black liquid. The liquid (which may not be an apt moniker depending on your definition) is tar pitch, or bitumen, and that's where the mundane properties stop. At room temperature, pitch looks solid. In fact, it can be shattered with a hammer. But it actually flows at a rate of approximately one drop every 10 years.