The transparent proteins, crystallins, remain essentially unchanged for the rest of our lives. Thus they provide a record of the environment we spent our first days in – including the type of radiation
1945-1960 nuclear bomb tests meant the quantity of C-14 in the atmosphere doubled. Since 1960 it has slowly decreased to natural levels
The fallout got into the food chain & into our crystallins. These proteins reflect the content of C-14 present in the atmosphere at the time of their creation, shortly after birth.
So there is no point lying about your age – at least if you were born during the years of variation
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