Cold per se doesn't make you sick, but with THIS weather and lack of central heating systems in KM, I'd say I have been almost suffering of hypothermia after over a month of bearing low temperatures when away from two heaters I bought (which I still try to use them only when it is really cold, like today).

I think the idea of having a constant fresh airflow is plain stupid these days, more so due to the pollution levels we have been reaching in December and end of November. Alas, in autumn and winter we have higher pollution levels everywhere because of low-pressure conditions. Last Monday I stayed at home, not just refusing to chill my bones in my shared office (with open windows I keep on closing), but mainly because of the AQI that from red levels skied up into purple for 2 or 3 hours.

All in all, windows closed allow for better health conditions, especially to foreigners less used to Chinese cold and flu strains.

I also try to wear PM 2.5 masks on public transports (when I seldom used them, outside my cycling routine), in which the dry air allows for the spreading of viruses at a longer distance. And we know Chinese do not cover their mouths when sneezing, coughing, etc...

Very good idea.
With the new Italian restaurant the competition will be arsh. I still have to try their pesto, but I expect it to be good.

Pesto is one of the most expensive sauces you can buy, due to the amount of parmesan and pine nuts in it. (not to mention that that disgusting Olivoilà has to be out of your shopping list!)

Italians know very well the real pesto is totally different from the sour one that comes in jars. If you manage to be up the Genoa standard, people will be very happy to spend that money!

Using the software Psiphon is rather straight forward. It's made by Iranians. They also have quite a lot to teach on how to overcome these barriers...!