'The vast majority of this second-lightest gas comes from natural gas fields in the U.S.'
helium
SCIENCE: The vast majority of this second-lightest gas comes from natural gas fields in the U.S.
The vast majority of this second-lightest gas comes from natural gas fields in the U.S.
The vast majority of this second-lightest gas comes from natural gas fields in the U.S.
SCIENCE
helium
SCIENCE