What scientists are calling a "game changer" for society has been discovered deep in Tanzania's Rift Valley: a massive helium gas field with enough of the precious commodity to fill more than 1.2 million MRI scanners, Phys.org reports. Besides the sheer amount of gas, the discovery is notable because it appears to be the first time that stores of helium have been purposely found (they're usually stumbled upon during oil and gas drilling). And the find, which will be presented Tuesday by Durham University PhD student Diveena Danabalan at a Japanese geochemistry conference, could help restock nearly depleted stockpiles. Researchers...