Critical Mass

The Science of Human Behavior

In 1690, Sir William Petty presented a radical idea to the English royalty. He believed the strength and wealth of a nation could be proven through math rather than just opinions. Petty argued that by focusing on number, weight, and measure, he could demonstrate that England was a secure and growing power. His goal was to create a science of politics that relied on visible facts in nature, setting aside the unpredictable passions of individual people. He argued that while individual human nature is difficult to forecast, the collective state of a society can be understood through quantification.

Around the same time, Thomas Hobbes sought to find a way to build a society that could never again fall into the brutal conditions of the English Civil War. Influenced by his meeting with Galileo, Hobbes embarked on an ambitious quest to create a physics of society. He viewed the human being as a sophisticated machine governed by the laws of motion. In this view, the mind was a calculating device, and the body was a system of pulleys and strings moved by nerves and muscles.

From these mechanical principles, Hobbes deduced that the primary force driving human interaction is the restless lust for power. To escape a violent competition for survival, Hobbes proposed the social contract. He argued that rational individuals would voluntarily agree to surrender their personal rights to a single, absolute authority. This sovereign power would have the mandate to enforce peace through strength, ensuring that the collective body politic functioned with the regularity of a well-made clock.

While Hobbes’s vision of an absolute ruler was widely detested by his contemporaries, it established a revolutionary precedent. He was the first to suggest that human behavior and social organization could be understood through the same rigorous methods used in mathematics and physics. He moved political theory away from what ought to be toward a study of how things actually are. This approach laid the foundational idea that society is a statistical system.

Today, this desire for a rational theory of human affairs has shifted to the study of collective behavior. Modern physics is now being applied to social systems because it excels at understanding how order emerges when many individual parts interact. Just as atoms follow simple rules to create complex materials, human groups often show predictable patterns when they act together. By studying how people move through spaces or make economic decisions, we can begin to see a hidden structure in human life that may help us build a safer and more stable world.