The world's longest experiment is nearing the 100-year mark and can go on for many more centuries. The Pitch experiment has witnessed only nine drops, with the time between each of them increasing. Scientists say the physics inside the funnel is changing. 

99 years and counting: How an office upgrade further slowed down the world’s slowest experiment

Scientific experiments can take a few years to complete, but one of them has been going on for nearly 100 years. The slowest experiment in the world started in 1927, technically 1930, and is not over yet.

94 years, 9 drops: World's longest experiment started nearly 100 yrs ago and is still on

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99 years and counting: How an office upgrade further slowed down the world’s slowest experiment

94 years, 9 drops: World's longest experiment started nearly 100 yrs ago and is still on