It may only be theory, but in my opinion, after watching a documentary about an event that occurred 73 thousand years ago (give or take 4,000 years), I believe that this is actually true.

The following event convinces me that we are more connected to each other than most people give credence to.

Sometime around 73,000 years ago, one of the most massive forces in 28 million years occurred. Mt. Toba, located in Sumatra, Indonesia, exploded with a force beyond all imagination. Scientists have given this explosion a new term - not just a volcanic eruption, but a mega eruption. The eruption of Mt. Toba nearly eradicated all life on earth, including the human species. The devastation that followed was tremendous, leading to a volcanic winter and eventually an ice age. Amazingly, life did not go completely extinct. Most scientists agree that somewhere between 3,000 to 10,000 humans survived. These are our ancestors and relatives. This handfull of survivors have produced the 6,799,900,000 people on this planet, today. In essence, we are all connected.

Statist theories on optimal design of the ever increasing designs of cities, traffic flows, neighborhoods, and demographics, prompted Frigyes KARINTHY to publish a set of short stories, 1929, one of which was titled "Chains" or "Chain Links". "Due to technological advances in communications and travel, friendship networks could grow larger and span greater distances. In particular, KARINTHY believed that the modern world was 'shrinking' due to this ever-increasing connectedness of human beings. He posited that despite great physical distances between the globe's individuals, the growing density of human networks made the actual social distance far smaller.