The human eye blinks all the time, which is a normal reflection and can protect the eyes from dryness, bright light and dust. Whenever a human eye blinks, the eyelid spreads some kind of oils and mucus secretions on the surface of the eye to prevent the eyes from drying out.
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There are some superstitions related to blinking. The most common is - if your right eye blinks, then you will hear some good news, if your left eye blinks, then you will hear some bad news. Some people strongly believe in this superstition.
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