> Why is it that bees can carry on doing this for three (or five) years before the honey suddenly becomes 'contaminated' and the comb needs changing?
The solution is dilution - the accumulation of very low levels over time is halted by the recycling of combs.
There is a concept called "de minimis" at work here - there are low levels that are so low as to be essentially "zero", even if the level of detection keeps getting pushed downward.
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