From diamonds to nanotubes to DNA, carbon is indispensable for constructing practically all of the most intricate structures we know of.
Most of the carbon in our world comes from long-dead stars, in the form of Carbon-12: carbon atoms containing six neutrons in their nucleus.
It makes no sense at all if man appeared at the end of billions of years.
We will deal with carbon dating first and then with the other dating methods.
Carbon has unique properties that are essential for life on Earth.
"Every year the trees in our forests show the swing of Time's pendulum and put down a mark.
They are chronographs, recording clocks, by which the succeeding seasons are set down through definite imprints," he wrote in the pages of National Geographic.