Sixth Sense. Polarization. Discover Magazine. Haidinger Brushes.

Impressive gem of article/research/knowledge. Gave a "Wow!" moment. The Sixth Sense You Didn’t Know You Had, Discover Magazine. Juliette McGregor, University of Leicester, July 1, 2015 12:59 pm. Easy to describe. Easy to demonstrate. Relatively easy to replicate experiments. Centers around Haidinger’s brushes.

There are some practical medical applications with respect to Strabismus. [One of our little ones was though to have Strabismus... but not.  Also have old friend who works with such eye conditions.] Brought it up to others and they wondered if there might be other applications?