https://www.nist.gov/news-events/news/2020/07/nist-launches-studies-masks-effect-face-recognition-software#:~:text=NIST%20digitally%20applied%20mask%20shapes,algorithms%20developed%20before%20COVID%20appeared.&text=The%20answer%2C%20according%20to%20a,)%2C%20is%20with%20great%20difficulty.