The article focuses on oxygen and its involvement in scientific processes such as geology. It narrates that the element was discovered by William Scheele in Uppsala, Sweden in 1773 and was intimately associated with the evolution and origin of life, with oxygen levels estimated to have occurred between 3.8 and 2.7 billion years ago. It adds that the oxygen isotope distribution of the sun may not reflect that in meteorites though the source of their distribution remains unsolved.