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Heres our arts correspondent, david sillito. Three, two, one. Happy birthday to you. We are in a basement, in a zero particle clean room, listening to happy birthday being sung over and over again. Happy birthday, dear susan. The reason . To try to find out if singing is any riskier than speaking. So, what is being measured here is what is coming out of our mouths, the big droplets that maybe go about two metres, but also the much, much smaller ones, and that has been captured by this, what is known as the aerosol. Happy birthday, dear susan. Happy birthday to you. Droplets are typically understood to fall a metre or two in front of the face and that is the basis of social distancing. The aerosols on the other hand are much smaller and they hang around in the air and until they are ventilated away, they hang around exactly where they are. Choral singing was one of the first activities to be shut down and when lockdown was eased, singers were still told to be three metres apart. Those r

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