Isaac Newton as believers in a biblical creation narrative. This argument usually involves scientists who were no longer alive when evolution was proposed or whose field of study did not include evolution. The argument is generally rejected as specious by those who oppose creationism. Many of the scientists in question did some early work on the mechanisms of evolution, e.g., the modern evolutionary synthesis combines Darwin's theory of evolution with Mendel's theories of inheritance and genetics. Though biological evolution of some sort had become the primary mode of discussing speciation within science by the late-19th century, it was not until the mid-20th century that evolutionary theories stabilized into the modern synthesis. Geneticist and evolutionary biologist Theodosius Dobzhansky, called the Father of the Modern Synthesis, argued that "Nothing in biology makes sense except in the light of evolution," and saw no conflict between evolutionary and his religious beliefs. Nevertheless, some of the historical scientists marshalled by creationists were dealing with quite different issues than any are engaged with today: Louis Pasteur, for example, opposed the theory of spontaneous generation with biogenesis, an advocacy some creationists describe as a critique on chemical evolution and abiogenesis. Pasteur accepted that some form of evolution had occurred and that the Earth was millions of years old. The relationship between religion and science was not portrayed in antagonistic terms until the late-19th century, and even then there have been many examples of the two being reconcilable for evolutionary scientists. Many historical scientists wrote books explaining how pursuit of science was seen by them as fulfillment of spiritual duty in line with their religious beliefs. Even so, such professions of faith were not insurance against dogmatic opposition by certain religious people. Forums Debates Many creationists and scientists engage in frequent public debates regarding the origin of human life, hosted by a variety of institutions. However, some scientists disagree with this tactic, arguing that by openly debating supporters of supernatural origin explanations (creationism and intelligent design), scientists are lending credibility and unwarranted publicity to creationists, which could foster an inaccurate public perception and obscure the factual merits of the debate. For example, in May 2004 Michael Shermer debated creationist Kent Hovind in front of a predominantly creationist audience. In Shermer's online reflection while he was explaining that he won the debate with intellectual and scientific evidence he felt it was "not an intellectual exercise," but rather it was