This website lets you locate the blind spots on your retina, where the optic nerve is connected. Once you have done that, some more blind spot activities are linked on Metafilter.
An interesting side note is that due to their optical anatomy cephalopods, such as squid and octopodes, do not have blind spots.
Author: Milan
In the spring of 2005, I graduated from the University of British Columbia with a degree in International Relations and a general focus in the area of environmental politics. Between 2005 and 2007 I completed an M.Phil in IR at Wadham College, Oxford. I worked for five years for the Canadian federal government, including completing the Accelerated Economist Training Program, and then completed a PhD in Political Science at the University of Toronto in 2023.
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Video version of the Thatcher Effect
By Mark Frauenfelder on Science