Potassium - 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 potassium -- an "evil" element, but one that's crucial to life. In this video, see some violent explosions and the gentle creation of a potassium mirror.
The radioactive isotope 40K occurs in natural potassium. 40K represents the largest source of radioactivity in your body, greater even than 14C. About 4,400 nuclei of 40K decay per second in an adult human body of 70 kg mass.
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