Stephen Petty - On the effectiveness of masks

First published at 08:57 UTC on May 10th, 2022.
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Source - Senate Health and Human Services
https://youtu.be/hZb3ND7Q1B8
"Stephen Petty is a Certified Industrial Hygienist (C.I.H.), Certified Safety Professional (C.S.P.), and Professional Engineer (P.E.). He has been a testifying expert in nearl…

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SensitivityNormal - Content that is suitable for ages 16 and over
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