jaF0
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With world supplies running out, the find is a "game-changer", say geologists at Durham and Oxford universities.
Helium is used in hospitals in MRI scanners as well as in spacecraft, telescopes and radiation monitors.
Until now, the precious gas has been discovered only in small quantities during oil and gas drilling.
Using a new exploration approach, researchers found large quantities of helium within the Tanzanian East African Rift Valley.
They say resources in just one part of the Rift valley are enough to fill more than a million medical MRI scanners.
http://www.bbc.com/news/science-environment-36651048