Many diseases are spread by poor coughing and sneezing techniques. Most people put their hands in front of their mouths and noses to stop germs from getting into the air. Unfortunately, this technique puts the germs on their hands. The germs are then spread to telephones and doorknobs and many other surfaces from which they are then picked up by the next user. This is how colds spread quickly through schools and workplaces, and how the flu spreads quickly through entire cities. It would be very easy to cut this mode of infection drastically by simply getting people to cough and sneeze properly.