An isotope is one of two or more atoms of the same chemical element with the same atomic number, occupying the same position on the periodic table and having almost identical chemical behavior, but ...

Free molecular oxygen (O 2) is released by photosynthesis into the atmosphere and is essential for all breathing animals. With exception of data for the last 800,000 years from air inclusions in polar ...

Sixty years ago, the very first samples of rainwater were collected for the Global Network of Isotopes in Precipitation (GNIP), while the science of isotope hydrology was still taking its first steps.

When you hear the term “radioactive” you likely think “bad news,” maybe along the lines of fallout from an atomic bomb. But radioactive materials are actually used in a wide range of beneficial ...