Since 2007, people standing around waiting for buses in Vancouver have had something to do -- specifically learning about how far droplets from a sneeze can travel. The answer is up to 12 feet, (3.65 meters) according to bus shelter billboards for Science World, a non-profit organization that operates an interactive museum in British Columbia.
The billboard is simply a large yellow circle in a white field with only a small Science World logo atop a push button and the tantalizing text, "Press here and we'll explain." Passersby curious enough to push the button are rewarded with a simulated sneeze in the face. A recording of a sneeze noise is accompanied with a mist of water vapor sprayed from the sign at face level. A recorded voice explains how far a sneeze can travel and includes the Science World "We Can Explain" tag line.