Последние добавленные видео:
effectiveness-of-masks
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3 года назад
1051 3 года назад 2:09The effectiveness of masks
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5 лет назад
8296 5 лет назад 2:26New study shows effectiveness of face masks
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5 лет назад
1196 5 лет назад 2:06New study shows effectiveness of different types of masks
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5 лет назад
3950 5 лет назад 1:33US experts comment on effectiveness of face masks
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5 лет назад
852 5 лет назад 1:29Effectiveness of face masks
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5 лет назад
43112 5 лет назад 1:55Study highlights effectiveness of masks and raises issue with visors in Covid-19 fight
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5 лет назад
24361 5 лет назад 1:57FAU researchers look at effectiveness of different styles of face masks
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5 лет назад
264335 5 лет назад 3:48Seeing is Believing: Researchers Test Effectiveness of Facemasks and Social Distancing
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5 лет назад
643 5 лет назад 2:15Debate Continues Over Effectiveness Of Face Masks As Nationwide Guidelines Are Expected
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5 лет назад
1108 5 лет назад 1:54Mixed messages on use, effectiveness of face masks persist during COVID-19 pandemic
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5 лет назад
2178 5 лет назад 2:04Health experts debate effectiveness of face masks during coronavirus crisis
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5 лет назад
2984 5 лет назад 7:44The Science of Masks
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4 года назад
1595 4 года назад 1:33Mayo study supports effectiveness of masks and social distancing