Join Paul Dancstep for a presentation about quantum mechanics and the elements of the periodic table—starting with boron. Boron is complicated. Elusive. Tough. Created in collisions between cosmic rays and interstellar dust, pure boron may be found in meteoroids, but not naturally on Earth. Yet this relatively uncommon element is essential for plant growth and readily appears in compounds such as borax, famously conveyed by 20-mule teams across Death Valley. A brittle metalloid, boron behaves somewhat like a metal and somewhat like a non-metal. It can be reactive or unreactive, crystalline or powdered. It can shift from three to four atomic bonds. Imagine boron as elemental spy: enigmatic except in its useful effects.