If you're breathing more heavily from exercise, won't that make masks less effective? Air will be forced in and out to a greater extent, and in around the gaps between mask and face.
Isn't this what I've been saying?
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In his letter, Sir Tim said the UK would not participate because the "UK would be required to stop its negotiations with manufacturers with which the EU launched negotiations".
He said the commission had also confirmed it was "not possible for the UK to have a role in the governance shaping decisions on which manufacturers to negotiate with, or the price, volume and delivery schedule negotiated".
Sir Tim added that there could still be collaboration between the UK and the EU on areas such as "sharing of information on promising vaccine candidates" and "vaccine trials" and "manufacturing investments and capacity building".
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The EU seeking total control.