On Mount Athos in northern Greece, a centuries-old tradition continues as a monk rises before dawn to perform chants first established over a millennium ago. This remarkable preservation of cultural practice exemplifies the enduring nature of culture, which some scientists argue is not merely symbolic but a form of life in its own right.
Traditionally, life has been defined by biological criteria such as the ability to encode, process, and transmit information—functions carried out by genes in organic organisms. DNA carries instructions for survival and reproduction, which evolve over generations through mutation and natural selection, resulting in the diversity of life on Earth. However, human culture represents a distinct mode of self-perpetuating information that predates written language and differs fundamentally from genetic inheritance.
Culture consists of behaviors and knowledge socially transmitted from one individual to another. While once thought unique to humans, animal cultures have been identified in species such as chimpanzees in West Africa, which demonstrate region-specific tool use and foraging techniques despite sharing the same environment. This suggests culture as a form of adaptive information transmission is more widespread in the animal kingdom than previously recognized.
Human ancestors, emerging around 2.6 million years ago, experienced a significant shift in evolution during a series of ice ages. Cultural innovation increasingly influenced survival and reproduction, surpassing genetic adaptation in importance. Hunter-gatherer societies developed complex practices, from toolmaking to food preparation, promoting changes in human anatomy such as reduced jaw size and gut volume alongside rapid brain expansion. These larger brains enhanced capacities for cultural learning and transmission.
The advent of language marked a transformative milestone in cultural evolution. Language enabled more precise and efficient communication of knowledge and skills, facilitating accelerated innovation and dissemination. As linguistic ability grew, so too did the complexity and scope of cultural information, creating a feedback loop that shaped both cognitive development and social organization. Unlike genetic traits, specific words and languages are acquired rather than innate, but the neurological capacity to learn and employ language became biologically embedded in humans.
This interplay between culture, language, and brain evolution fostered the diversification of human societies, producing distinct religions, arts, agricultural systems, and civilizations across the globe. Despite limited genetic variation, cultural evolution propelled humanity into unprecedented realms of achievement, from fine arts to advanced technologies.
The evolution of life on Earth can thus be seen as occurring in two broad phases: biological and cultural. Presently, researchers observe what may herald a third phase, driven by machines capable of autonomously writing and improving their own code. This emergent form of self-sustaining information could define a new mode of evolution, raising profound questions about humanity’s future trajectory.
Understanding the long interplay of biological and cultural evolution may offer critical insights as society navigates this potential next step in the history of life. The continuity of tradition on Mount Athos serves as a microcosm of culture’s resilience and adaptability, qualities that may prove essential as humanity contends with rapid technological change.