http://www.nature.com/news/world-s-slowest-moving-drop-caught-on-camera-at-last-1.13418
After 69 years, one of the longest-running laboratory investigations in the world has finally captured the fall of a drop of tar pitch on camera for the first time. A similar, better-known and older experiment in Australia missed filming its latest drop in 2000 because the camera was offline at the time.
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