Considered by some to be the world's most boring experiment, it had a huge flutter of excitement in April 2014, with the completion of the ninth drop. This time, this was caught on camera (thanks to three webcams) after the previous drop (in 2000) was missed due to a power outage.
What is all this about?
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The University of Queensland, Australia's Pitch Drop Experiment, which measures the flow of "pitch", a liquid so viscous that it can take over a decade for a drop to fall down.
More here.