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As a result it is always undergoing natural radioactive decay while the abundances of the other isotopes are unchanged.

Carbon-14 is most abundant in atmospheric carbon dioxide because it is constantly being produced by collisions between nitrogen atoms and cosmic rays at the upper limits of the atmosphere.

44 AD-Pomponius Mela authors — three volumes describing the "known" world, including fabulous creatures and peoples in distant lands. 50-Roman army surgeon Dioscorides compiles information on medicinal plants that will survive as a trusted resource for centuries in the form of . 78-Pliny the Elder publishes a 37-volume natural history encyclopedia.

Mark Norell later described as an ‘unfortunate chapter’ in modern paleontology would foreshadow a growing and serious problem of fraudulent fossils being produced on an industrial scale in China.

‘To formally name a dinosaur, or any other species, a description must be prepared and published’, wrote Norell in his book Unearthing the Dragon.

“Peer review, and pre-peer review, had rejected the paper’s conclusions and evidence and it never appeared in a scientific journal.” So why did National Geographic choose to go ahead and publish a description of the species when it had been turned down by academic journals?

For a non-academic, popular magazine it was heading into uncharted and risky territory.