What is tin foil on doorknob?

Tin foil can be wrapped around a doorknob as a means of protection from germs and other contaminants. It is believed that the virus that causes COVID-19 can live on surfaces for several hours or even days. By wrapping a doorknob with tin foil, it creates a barrier that can prevent the virus from being transmitted from one person to another.

However, it is important to note that this method of protection is not foolproof and should not be relied on as the sole means of preventing the spread of COVID-19. Regular hand washing, wearing a mask, and practicing social distancing are still the most effective ways to prevent the transmission of the virus.