The science didn't change, the virus did, Fauci says as CDC updates mask guidance. #discovery #Science #technology #tech #research #education #scientists https://t.co/388b5ktm0a
— Yusra Salim | يُسرى بِنْت سالم (@Shulab) Jul 28, 2021
from Twitter https://twitter.com/Shulab
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