Sometimes the simplest objects can tell the most powerful stories.
Open windows and doors, use fans, and set your aircon to pull fresh air from outside.
The advice on wearing masks in public has just changed in Australia. Here are your options if you live in Melbourne or other areas with high rates of community transmission.
As Melbourne returns to lockdown, the evidence suggests routine mask-wearing - as seen in many countries but not so far in Australia - could be a valuable tool to help stop the spread of COVID-19.
Face masks are a cheap, effective public health "frontline" against epidemics such as swine flu, UNSW infectious disease expert Professor Raina MacIntyre says.