A common means of transmitting illness is shaking hands with others and then touching food. Some people suggest that we would be healthier (and perhaps avert epidemics) if we bowed or waved in...

A common means of transmitting illness is shaking hands with others and then touching food. Some people suggest that we would be healthier (and perhaps avert epidemics) if we bowed or waved in greeting instead of shaking hands. What do you think? For an excellent video about Mary Mallon as well as discussion guides and ethical analyses, see www.pbs.org/wgbh/nova/typhoid.