Everyone blinks. The lids move to close the eyes for a moment and move back to open them. If the radius of the eyeball is about 1 centimetre and the lids moves back about the double of the radius of the eyeball, estimate the speed with which we blink our eyes if the time for 50 blink is 16 2/3.
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The average person blinks every 4 seconds – that is about 15 times per minute, or over 20,000 times a day, depending on how long the person stays awake. Each blink lasts about a tenth of a second, which isn't a lot of time.
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