Evolution Day

What Is Evolution Day? Commemorating the Publication of Darwin's "On the Origin of Species"

November 24 is "Evolution Day." It commemorates November 24, 1859, when Charles Darwin's seminal work "On the Origin of Species" was published in London. This book is one of the most influential works in the history of science: through the theory of "natural selection," it explained the diversity and evolution of living things, fundamentally overturning the religious and fixed view of life that had come before.

How "On the Origin of Species" Changed the World

• A revolution in biology: It established the concept that all living things diverged and evolved from common ancestors
• Conflict with religion: It sparked an intense debate with creationism — the belief that "a god created all living things" — a debate that continues to this day
• Integration with genetics: Combined with Gregor Mendel's laws of heredity, it led in the 20th century to "Neo-Darwinism" (the modern synthesis)
• Influence on society and ideas: It influenced a wide range of intellectual movements — for better or worse — including social Darwinism

The Basics of Evolution: What Is "Natural Selection"?

Natural selection is the mechanism by which individuals with traits suited to their environment are more likely to survive and reproduce. Over many generations, advantageous traits spread through a population, eventually giving rise to new species. It's a bit different from simple "survival of the fittest" — the key factor is whether a trait suits the environment. A common example is the giraffe's long neck, often explained by the idea that individuals able to reach leaves high in trees were more likely to survive. Interestingly, in the first edition of "On the Origin of Species," Darwin did not use the word "evolution" but "descent with modification"; it was the philosopher Herbert Spencer who popularized "evolution" in this sense.

Something to Think About on Evolution Day

Humans, too, are a product of evolution. Advances in genome analysis have revealed that human and chimpanzee DNA is about 99% identical, and that modern humans carry traces of Neanderthal DNA. Let this day be a chance to once again appreciate the wonder and diversity of life.