If memory serves, Rob Slade had a bit of a screed on masks (see
RISKS-31.65), and was taken to task for it.  Then I commented on the 6-foot
thing, and there was some response around that issue, partly by Herr Doctor
Professor Peter Ladkin—who had been watching it, and referred to a study
and to a movie, "the Sneeze".

We now have better science to design controls, such as https://www.pnas.org/content/118/17/e2018995118 and while the guidance doesn't quite invert the previous recommendations, it deeply changes the advice.

The risks are subtle, and perhaps not precisely computer-related, but more
[generally] "science" related: the risks of jumping to a control with
limited scientific information, applying controls inexpertly, failure to
change the control regime in a timely fashion when the data changes, etc.

  [In retrospect, the Pandemic is still an evolving exercise a year later.
  PGN]

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