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TIL the pitch drop experiment is the world’s longest continuously running laboratory experiment. It measures the flow of a piece of pitch by counting the drops that fall from a funnel. Since 1927 8 drops have fallen. The ninth drop is expected to fall in 2013.

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VMRrk TIL that the first attempt to make an accurate world map was by an astrologer (Claudius Ptolemy, second century CE) so that he could chart the relationship between the person's birthplace and the heavenly bodies. While doing so, he coined the term "geography"
RQa6 TIL that the Netherlands used to flood certain areas in times of war to create a military defensive line. The water was too shallow for boats, but deep enough to hide traps and ditches under.
oEXL TIL: The last time the Houston Astro dome hosted the Super Bowl in 2003, was vaunted as the “Greatest Super Bowl of all Time” It’s also when Janet Jackson had her live “nipslip” performing w/Justin Timberlake. A guy frustrated trying to find clip the next day had a decent idea and created YouTube.
rRE0M TIL of the disappearances of Terrance Williams and Felipe Santos. Both men went missing in 2004 and 2003, respectively, under similar circumstances in Naples, Florida. Both men were last seen being arrested by Steve Calkins, who claims he changed his mind about both arrests and let them go.
AAng TIL that there exist a tree with multi-hued bark, that gives it “rainbow colors”.