Why Do We Have Blind Spots?

Your brain is lying to you about what you see– find out why in this Quick Question!

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Sources:
http://www.livescience.com/52033-human-blind-spot-can-shrink.html
http://io9.com/5804116/why-every-human-has-a-blind-spot—and-how-to-find-yours
Online Eye Test: Find Your Blind Spot in Each Eye!
http://serendip.brynmawr.edu/bb/blindspot1.html
https://en.wikipedia.org/wiki/Blind_spot_(vision)
http://www.britannica.com/science/blind-spot
http://www.sciencedirect.com/science/article/pii/S0960982215008295