the.com/thulium
the rarest stable rare earth, lurking in lasers and portable X-ray machines nobody knows it powers
named afterThule, mythic land at the edge of the world
X-ray dutypowers field X-ray units when electricity vanishes
price tagcostliest of the naturally common rare earths
laser heartits lasers slice tissue in eye surgery
discoveryisolated 1879 from an already-contaminated sample