Some friends abroad may not understand why the Chinese (and many Asians) all wear masks and quarantine themselves at home spontaneously.

The video below explains the logic behind the transmission of coronavirus disease 2019 (COVID-19) and how to avoid it and slow it, to flatten the curve. It suggests to lessen time outside, wear maks in congested public areas, do some exercise, and keep yourself fit when staying at home. Keep the windows open sometimes, and wash hands immediately when going back home (probably a good idea to change your clothes too).