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

parnell-experiment

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parnell experiment

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