This is the longest known, uninterrupted experiment in the world.
In 1927, an Australian professor put an extremely viscous liquid (asphalt, a.k.a. The Pitch, which is commonly mistaken for a solid) into a funnel and it has been slowly dripping ever since.
It has dripped a drop only 8 times since 1938, and has never been seen by a human before. Now there is a web cam, and you can watch it slowly drip.
Very exciting.
Wiki:
http://en.wikipedia.org/wiki/Pitch_drop_experiment
Webcam:
http://www.theninthwatch.com/feed/
RadioLab Podcast about the Pitch Drop
http://www.radiolab.org/story/267176-never-quite-now/