Just because chemical equipment can measure parts per trillion doesn’t necessarily mean that they have any biological significance. If you took one pill of Tylenol and dissolved in an olympic-size swimming pool, that would roughly be 1 part per billion. One part per trillion would be one pill in 1,000 swimming pools. My point is that it is very hard to think in such fantastically small quantities, and it takes much more rigorous biological thinking to make scientific sense of the kinds of claims made in articles such as this one.

Timothy Brac
London, Ontario

From the Nature Index

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