Rare earth: why complex life is uncommon in the universe.
In 1839 the third source for rare earths became available.
China isn't the only nation with economic sources of rare earths, though.
Manufacturers sometimes add a second rare earth as a sensitizer.
Rare earths are a key element of the European economy.
Nuclear reprocessing is another potential source of rare earth or any other elements.
The world may soon face a shortage of the rare earths.
Solar panels use rare earth's even more finite than oil.
"That means there must be a supply of rare earths around here somewhere!"
"We still have to find that deposit of rare earths."
