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Erbium - 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. In this one, the professor explains why erbium is perhaps the most important element for websites like YouTube.

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Additional Resources for you to Explore
Check out this video on the Periodic Table of Videos' road trip to Ytterby.
For all the basics about erbium check out the Visual Elements Periodic Table.
For amazing photos and facts about erbium, check out The Elements by Theodore Gray.
Normally when you put energy into a material, its temperature rises. In 2006, it was reported by researchers at the University of the Basque Country that a glass of potassium lead chloride doped with erbium actually became cooler when a laser beam was focused on it.
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How do you think it is possible to put cables under the ocean? How would you access it when it becomes necessary to repair a part of the cable?
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