There can be reliable phenomena that are not limited to the laboratory. For example, increasing the number of bystanders has been found to inhibit helping behaviour with many kinds of people, including children, university students, and future ministers; in Israel; in small towns and large cities in the U.S.; in a variety of settings, such as psychology laboratories, city streets, and subway trains; and with a variety of types of emergencies, such as seizures, potential fires, fights, and accidents, as well as with less serious events, such as having a flat tire. Many of these replications have been conducted in real-life settings where people could not possibly have known that an experiment was being conducted.