How much of your waking day do you spend with your eyes shut?

You blink so often that your eyes are closed for about a tenth of every waking hour, and you never notice.

An adult blinks roughly 15 to 20 times a minute, and each blink lasts about a quarter of a second. Added up, that is close to 10 percent of your waking time spent in the dark. You miss it because the brain quietly dampens vision during each blink, so the world looks seamless.

Watching a two-hour film, your eyes are actually shut for something like 10 minutes of it, yet the movie never seems to flicker.

A big slice of your day is spent blind, and your brain edits the gaps out so smoothly you never feel them.

It shows how much your brain smooths over to give you a steady picture of the world, instead of showing you the raw, gappy feed your eyes send.

Blink math: 1 in every 10 waking minutes, lights off.

Learn the idea and practice English at the same time.