Rare earths are not rare; the problem is that they don't often occur in concentr...

		kwhitefoot on June 23, 2015 \| parent \| context \| favorite \| on: The Way Humans Get Electricity Is About to Change Rare earths are not rare; the problem is that they don't often occur in concentrated ores. See https://en.wikipedia.org/wiki/Rare_earth_element#Geological_...