What is tin foil on doorknob for safety?

Tin foil on doorknob is a safety measure to protect against static shocks caused by touching the door knob. It works by creating a barrier that prevents static electricity from building up and discharging when someone touches the doorknob. Static electricity is more likely to occur in dry environments, so this safety measure is especially useful during winter months when indoor heating systems tend to dry out the air. Additionally, it is commonly used in hospitals and other healthcare settings to reduce the risk of infection transmission from door knobs and handles. The tin foil can be easily removed and replaced as needed to maintain its effectiveness.