This transformation may be accomplished in a number of different ways, including alpha decay (emission of alpha particles) and beta decay (electron emission, positron emission, or electron capture).
A particular isotope of a particular element is called a nuclide. That is, at some point in time, an atom of such a nuclide will undergo radioactive decay and spontaneously transform into a different nuclide.
The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.
and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.
Benner was quite transparent about four hurdles he called “paradoxes” that still challenge theories for getting from chemicals to a Darwinian replicator.
He transparently admitted failure in all four of them: We have failed in any continuous way to provide a recipe that gets from the simple molecules that we know were present on early Earth to RNA.
From there, the interview devolved into matters of funding.