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Polarized sunglasses allow you to see the orientation of light. That combined with birefringence can help you see patterns of stress inside materials. But how does that work exactly?

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CHAPTER TIME CODES

00:00 Cold Open
00:39 Polarization Explained
03:24 Birefringence Explained
04:18 Pattern Examples
05:18 Types of Glass
06:17 Breaking Glass
07:34 Summary
08:00 Sponsor Message
09:08 Outro
09:33 Featured Comment
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Corrections:

5:43 Just to clarify: Side windows and rear windshields of automobiles are tempered. Front windshields are annealed, specifically two pieces of annealed glass with plastic between them to hold it together.