Praseodymium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about praseodymium, an element used to filter harmful light. Praseodymium has even helped slow light's speed down to a mere 300 meters per second!
Why is praseodymium used in welder's goggles?
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TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.
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