Can a Mask Make You Immune to Covid?

Scientists explore an old treatment while we wait for a vaccine

Nurse vaccinates woman against smallpox, diphtheria, and typhoid. (Library of Congress, Public Domain).
Nurse vaccinates woman against smallpox, diphtheria, and typhoid. (Library of Congress, Public Domain).

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Richard J. Goodrich - The Peripatetic Historian

The Peripatetic Historian: former history professor now travelling the world and writing about its history. Newsletter: http://rjgoodrich.substack.com.