There is a known constant concentration of C14 in Nature.
As we consume living things to survive our bodies (made of carbon) stop replenishing our body's carbon (we stop eating) and start to decay.
The crane takes 5 s to push the ball into the building.
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More often, rocks are “dated” by the fossils they contain, based on a pre-existing belief in evolution.So, using carbon dating for fossils older than 60,000 years is unreliable.Carbon dating was developed by American scientist Willard Libby and his team at the University of Chicago.The amount of carbon-14 gradually decreases through radioactive beta decay with a half-life of 5,730 years.So, scientists can estimate the age of the fossil by looking at the level of decay in its radioactive carbon.