There are 17 rare earth elements. While almost all of them have vital industrial uses, you could be forgiven for believing, based on news coverage, that there are only four that matter: neodymium, praseodymium, dysprosium, and terbium.To be sure, those are the essential ingredients in…

This is a short, automatically-curated summary. Read the full article at spectrum.ieee.org: China’s Grip on Erbium and Yttrium Could Choke Data-Center Growth →