A Good Day to Celebrate Science
Today, November 24, 2009 marks the 150th anniversary of the publication of The Origin of the Species by Charles Darwin. This now notorious book is perhaps more than any other both the most reviled and the most admired book in the history of science. Darwin set off a stormy debate and protest that has resonated through generations and continues to this day. And the world remains almost as divided today as it did 150 year ago on the book.
It is perhaps risky for a non scientist like myself to speak to a scientific subject. However Darwin’s theory has suffered from attacks most frequently from non-scientists, most often in relation to educational policy. Non-scientists involved in policy making and politics have an obligation to understand and appreciate what Darwin had to say.
Resistance to Darwin is based on two sets of arguments, the first dating back to when he first published and the other having more modern origins. The first are rooted in his fundamental observation that animal (and plant) forms, or species, change in their basic make up over time. This runs counter to the fundamental Christian belief that all life was created by God and remains immutable in keeping with God’s design. He made things worse by suggesting that these changes result in evolution, and that over time species adapt to their environment. This he said can lead over much longer periods of time to the creation of new species that are related to but fundamentally different from existing ones. All of this was and is seen as radical challenge to the notion of God the Creator. As such, it has been the centre piece of Christian objections to Darwin ever since the publication of the Origin of the Species .
The second set of arguments, more recent in origin, relate to the argument for intelligent design. This argues that the theory of evolution contains no convincing mechanism that can explain the amazing detail and complexity of functioning organisms. In fact, it is argued, the complexity, sophistication and functionality of organisms can only be explained by the existence of an intelligent designer. Since this designer cannot be observed at work, it is not much of a stretch to name her God. Whether this is the same God as that of Christians is often glossed over, but it is at least plausible that it is.
A problem for those who object to evolution is that any reasonable person can observe from the historical record that, through generations, life forms do change, and often in a way that suggests survivability of some and extinction for others.
At one time some argued that the fundamental changes that take place occur during the life time of single individuals, sometimes in response to their environment. This is now accepted as false with respect to the basic characteristics or traits of species. In simple terms, the traits of individuals are immutable during one’s lifetime (nature), even though behavior of individuals may respond to environment (nurture). It is now agreed that change in basic characteristics has its source in an inter-generational process.
Darwin’s description of this process of change has largely survived intellectual and scientific challenge. He said that individual members of species have different traits, (variability), these traits are transmitted by parents to offspring and that offspring assume a mix of traits of parents, (heritability), some of the (different) offspring are better than others at competing for scarce resources (scarcity) and thus some survive the competition for scarce resources while others die out (natural selection). As a result, over time, some traits dominate the make up of members of species while others die out and disappear.
Some things are left unexplained by this. It took the development of genetics and gene theory to fill the blanks. There are still questions about how to explain the source of all of the variability among individuals, although it would be generally accepted that random mutations are part of the explanation.
Darwin’s genius was to set an overall framework of change and survival of life forms based on scientific observation. If we did not have Darwinism, we would have to invent it. His book is a remarkable work that has weathered 150 years of criticism intact.
His findings are nevertheless the subject of continuing debate in educational policy. Anyone who has been a Minister of Education or a member of a public school board knows that anti-Darwinism is very much alive and well. Alberta recently made a concession to these views in its curriculum. Other school boards are less than clear in their handling of the teaching of evolution.
It is important that the case for the science of evolution be supported. We cannot expect to have first class educated young people who respect and understand science if we waffle on evolution. And pretty much everyone agrees that educated people are fundamental to maintaining a modern, knowledge based, high value added, high productivity economy.
The scientific case for evolution is unassailable. Everyone in public life and education should celebrate Darwin’s findings, in recognition of good science and the importance of defending its findings.