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Coronavirus: Justified Practical Advice Thread

According to this NYT article, Covid pneumonia often (in most cases?) initially causes low blood oxygen without obvious respiratory discomfort or shortness of breath ("silent hypoxia"), and early detection of this can be critical. If true, it is a very strong argument in favor of pulse oximeter.

Rationality Quotes May 2014

I wander through
the dark wilderness
by the light
of my burning map

-- Lucien Zell (can't find an authoritative attribution)