Why do we spend roughly 10% of our waking hours with our eyes closed -- blinking far more often than is actually necessary to keep our eyeballs lubricated? Scientists have pried open the answer to this mystery, finding that the human brain uses that tiny moment of shut-eye to power down.
We blink more often than is necessary, a mystery that scientists explored by having subjects watch "Mr. Bean" videos. Blinking, it turned out, allowed their brains a momentary rest. (Giles Keyte)