Imagine an experiment so slow that it’s been running for nearly a century, and yet, it’s still not finished. This is the story of the world’s longest-running scientific experiment—and it’s about to reach a pivotal moment. But here’s where it gets fascinating: the next drop of this mind-bogglingly slow material could fall this year… or maybe in 2027. No one knows for sure. So, what’s all the fuss about? Let’s dive into the incredible tale of the Pitch Drop Experiment.
In 1927, Thomas Parnell, a professor at the University of Queensland in Australia, wanted to teach his students a lesson about fluid mechanics—specifically, how materials can defy expectations based on their viscosity. He chose pitch, a substance that looks solid but behaves like a liquid over time. Pitch is a viscoelastic material, meaning it sits on the blurry line between solid and liquid. When you hit it with a hammer, it shatters like glass, but given enough time—and we’re talking years—it flows like honey. Its viscosity is mind-boggling: 230 billion times thicker than water. Parnell’s idea was simple: demonstrate this by letting pitch flow through a funnel. But here’s the kicker—it took three years just to set up the experiment. He had to melt the pitch, pour it into the funnel, and then wait for it to cool and stabilize. And this is the part most people miss: the cooling process alone took years because of the internal stresses created by heating such a viscous material.
The experiment officially began in 1930 when Parnell cut the tip of the funnel, likely in front of a captivated classroom. But then… nothing. Days turned into months, and months into years. It wasn’t until eight years later that the first drop finally fell. Talk about patience! And the irony? No one was there to witness it. Parnell missed the second drop too, which fell in 1947, just a year before his death. But here’s where it gets controversial: Is this experiment a masterpiece of scientific patience, or just a quirky relic of history? Some argue it’s a waste of time, while others see it as a testament to the power of long-term observation.
Fast forward to today, and the experiment is still going strong—96 years and counting. Only nine drops have fallen since 1930, the last one in 2014. The tenth drop is expected anytime now, but there’s a twist. After air conditioning was installed in the building in 1988, the interval between drops jumped from about eight years to 12–13 years. Why? Lower temperatures slow the pitch’s flow even more. And this is the part most people miss: The experiment was never conducted under controlled conditions, which adds an unpredictable layer to its already slow-paced drama.
If you’re eager to catch the next drop, you’re in luck. The experiment is now live-streamed, so you don’t have to camp out at the University of Queensland. But don’t blink—this is literally the world’s slowest show. As we approach its 100th anniversary, the Pitch Drop Experiment raises a thought-provoking question: What’s the value of an experiment that takes generations to unfold? Is it a scientific marvel or a lesson in futility? Let us know what you think in the comments—we’d love to hear your take on this uniquely patient piece of science history!
