Once, I asked myself: “How small is the world?” Before I came up with an answer, I thought “Why not ask how ‘big’ is the world?” Maybe it depends on what manner you measure the world.
In The Tipping Point, it mentioned the idea of six degrees of separation. This concept was defined in Wikipedia and it states that everyone is on average approximately six steps away from any other person on Earth, so that a chain of, “a friend of a friend” statements can be made, on average, to connect any two people in six steps or fewer.
To explain the six steps, one step or degree would mean your friend whom you have known firsthand and personally. The second step would be a friend whom you have known through a common friend, whom you have known firsthand and personally; or a friend of a friend. Then the third step would be a friend of a friend of a friend, and so on until you reach the six steps.
The Tipping Point was written by Malcolm Gladwell, a best-selling author of books such as Blink, and Outliers.
In the book, it mentioned the study of Stanley Milgram about his study called the small world experiment. In the study, they tracked chains of acquaintances in the United States by sending several packages to 160 random people living in Omaha, Nebraska, and asking them to forward the package to a friend or acquaintance who they thought would bring the package closer to a set final individual, a stockbroker from Boston, Massachusetts. It has been concluded that people in the United States are separated by about six people on average.