Why do I blink ?
We only blink for a tenth of a second but thats enough to get the dust and and things out of your eyes. when we have tears it goes in your eyes and when we blink it spreads it and that helps to keep our eyes clean and moisten our eyeballs. If your watching a program you might forget to blink and so it's a good idea to stop the program and have a time to blink !
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