Helium-4 (42He or 4He) is a non-radioactive isotope of the element helium. It is by far the most abundant of the two naturally occurring isotopes of helium, making up about 99.99986% of the helium on Earth.
..a gas called Helium-4, a very rare type of Helium....
[Helium-4 (42He or 4He) is a non-radioactive isotope of the element helium. It is by far the most abundant of the two naturally occurring isotopes of helium, making up about 99.99986% of the helium on Earth.] Is that you Mr White? Yeah, SCIENCE!
So, it’s not rare? An error like that makes you doubt everything the author says.
And ...
“They also calculate that this ‘sudden’ release of gas began roughly 2 million years ago, with the advent of volcanic activity there.”
Does Joe The Plumber understand what he read in Nature?