Are they on to something?

Studies of core samples from trees back up earlier research that shows increased levels of the metal tungsten in residents of this rural community who are searching for a cause of a leukemia cluster here.

Similar results have been found in Sierra Vista, Ariz., a comparable, rural desert town that also has a leukemia cluster and, like Fallon, a nearby military base.

If this IS what caused the “cluster“, what can be done to prevent it in the future?