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Why are we Afraid of the Dark?

Some experts say humans have developed this fear due to evolution. In prehistoric times, our ancestors were at high risk of being attacked by predators or enemies, when in dark. 
Hence, through evolution, the tendency to fear darkness developed. Also, in the dark, as we cannot see properly, it creates anxiety, making us imagine the worst possible outcomes. So, it is not the darkness itself that we find frightening, it is what or who lurks in that darkness. Also, if we observe other people getting afraid, or if we are told to be afraid about something, we immediately accept those things as scary. So, whether it is our parents warning us about the dark, or a horror movie showing a ghost appear in the dark, our brain latches onto it and starts getting afraid of the darkness.

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