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Aboveground nuclear testing almost doubled the amount of carbon-14 in the atmosphere. The black arrow shows when the Partial Test Ban Treaty was enacted that banned aboveground nuclear tests. A special kind of radiocarbon dating: Bomb radiocarbon dating.As we mentioned above, the carbon-14 to carbon-12 ratio in the atmosphere remains nearly constant.Estimating a date of mixture of ancestral South Asian populations Linguistic and genetic studies have demonstrated that almost all groups in South Asia today descend from a mixture of two highly divergent populations: Ancestral North Indians (ANI) related to Central Asians, Middle Easterners and Europeans, and Ancestral South Indians (ASI) not related to any populations outside the Indian subcontinent.ANI and ASI have been estimated to have diverged from a common ancestor as much as 60,000 years ago, but the date of the ANI-ASI mixture is a term for radiocarbon dating based on timestamps left by above-ground nuclear explosions, and it is especially useful for putting an absolute age on organisms that lived through those events.In The Cosmic Story of Carbon-14 Ethan Siegel writes: The only major fluctuation [in carbon-14] we know of occurred when we began detonating nuclear weapons in the open air, back in the mid-20th century.

Bottom line: Radiocarbon dating is a technique used by scientists to learn the ages of biological specimens from the distant past.

For example, at the ISS time goes slower, lagging 0.007 seconds behind for every six months.

For GPS satellites to work, they must adjust for similar bending of spacetime to coordinate with systems on Earth.

Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.

Time dilation explains why two working clocks will report different times after different accelerations.

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