After running since 1944, the pitch drop experiment at Trinity College Dublin has finally yielded results: a drop has been caught falling on camera.
Pitch is an extremely viscous substance, about 2 million times more viscous than honey. Drops take 7-13 years to form and less than a second to fall. A similar experiment has been running at University of Queensland in Brisbane, Australia since 1927...their next drop is expected to fall sometime later this year.