"Walking with Coffee: Why does it spill?"

Funded by the Defense Advanced Research Projects Agency. Thank you, government, for spending $170,000 on such an important study.

This may surprise you, but apparently if you don't want your coffee to spill you should put a lid on it.

http://journals.aps.org/pre/abstract/10.1103/PhysRevE.85.046117

(This post was originally made on Facebook. The date has been set to match the original.)