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First the link to this week's complete list as HTML and as PDF.
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Ahlawat et al. is of high practical importance for what individuals can try to do quite apart from state-mandated rules and regulations.
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False positive results in medical testing are a common and well known problem. When the prevalence – in the tested population – is low, the fraction of erroneous positive results can become high and even the majority of all such results. As Cohen et al. and Katz et al. confirm, it is well established medical practice to repeat all positive test independently. Inexplicably this seems never to be done with Covid and makes all published numbers highly questionable. As a corollary the rate of false positive tests for Covid remains unknown too.
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If the growing season effect on radiocarbon dating is as strong as Manning et al. suppose, then it ought to be as relevant for short-lived samples vs. tree ring calibration in Europe and elsewhere too.
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For all their beautiful diagrams, all Mason et al. can show is a confirmation that tin isotopy is worthless for provenancing tin sources. As tin isotopes are affected by fractionation and nothing else they are completely wrong to ignore a possibly large effect completely: All their Cornish tin samples come from hard rock mining in deep pits while prehistoric times utilized the far more weathered outcrops near the surface. We know nothing about how much of Cornwall's slight outlier position today stems from that factor alone.
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