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One of the world’s longest running experiments, now 69 years old, has finally captured on camera the fall of a drop of tar pitch.
The Dublin pitch-drop experiment was set up in 1944 at Trinity College Dublin to demonstrate the high viscosity or low fluidity of pitch — also known as bitumen or asphalt — a material that appears to be solid at room temperature, but is in fact flowing, albeit extremely slowly.
Video below the fold.