An NHS doctor has demonstrated how masks do not affect breathing - before urging everyone to 'stop being selfish' and help protect the country. In the video shared to Twitter, Dr Joshua Wolrich, 30, from London, can be seen sitting alongside a piece of medical machinery which monitors his oxygen saturation levels before and after wearing a mask - and the numbers don't change, Alongside the
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Covid-19: Masks do not affect breathing - NHS Doctor
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