Teanau Tuiono raised some very good questions about COVID-19 and winter. Winter is coming, what's planned? Well, around ventilation, if I could talk about ventilation because this comes up all of the time, I have looked very closely at the comparative effectiveness of those portable air cleaners versus opening the window. A portable air cleaner will change the air in a room about three times in an hour. Opening the doors and the windows will change the air in the room between 15 and 30 times in an hour. So opening the doors and the windows is still a better solution than putting in a portable air cleaner. Now, you come to winter and you say, "OK, but it's colder in winter, and therefore you don't want to have all the doors and windows open in winter."—fair point. Opening the window by about 1½ centimetres is going to change the air in a room about the same as a portable air cleaner. If you open the window 3 centimetres, which is still going to preserve most of the heat in the room, that will change it at roughly double the rate of a portable air cleaner. So our focus on portable air cleaners has been putting them in those places where there isn't natural ventilation, but where there is natural ventilation, that is going to be by far the best thing that we can do from a COVID-19 perspective. 