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Any contamination of a sample by outside carbon (even from the researcher's fingerprints) had to be fanatically excluded, of course, but that was only the beginning.
The best way to transfer the exacting techniques was in the heads of the scientists themselves, as they moved to a new job.
Tricks also spread through visits between laboratories and at meetings, and sometimes even through publications.
This was all the usual sort of laboratory problem-solving, a matter of sorting out difficulties by studying one or another detail systematically for months.
More unusual was the need to collaborate with all sorts of people around the world, to gather organic materials for dating.
Also, the Sun’s own magnetic field varies with the cycle, and that could change the way cosmic particles bombarded the Earth.