Sixty-nine years ago, a demonstration began at Trinity College Dublin to show that tar pitch, which looks like a glossy black rock, actually flows. The thick goop, with a viscosity 2 million times that of honey, dripped unseen from the tip of a funnel about once a decade - but last year, physics professor Shane Bergin finally caught it on camera. His time-lapse video garnered more than a million views from geeks around the globe.
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