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	Podcast:		BrainStuff
	Episode:		How do photochromatic lenses work?
	Category:		Science & Medicine
	Duration:		00:04:21
	Publish Date:		2014-02-12 19:44:47
	Description:		Photochromatic lenses darken when exposed to the sun. Discover where these lenses came from, how they work and why they're commonly referred to as "transition" lenses in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com See omnystudio.com/listener for privacy information.
	Total Play:		0