People can sense Earth’s magnetic field, brain waves suggest

submitted by useless_aether from sciencenews.org

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[–]Tom_Bombadil 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Polarized films can also be used to see areas of residual stress in clear plastics.

The stressed locations refract light at slightly differing angles, which allow the bent light to be filtered.

[–]magnora7 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

Yeah that is a very cool effect! It also brings to mind the rainbow in a puddle of oil on the ground in the rain, which refracts a rainbow of colors, the color depending on the thickness of the oil film on the water at that exact spot, which changes what frequencies are refracted and reflected. Light is so cool