5. Evolutionary Theory
Probably the most controversial entry on this list, evolution inspires more heated debate and animosity between its adherents and detractors than any other scientific theory, but let’s get a couple of points out of the way. Darwin never stated that humans evolved from apes; they both have a common ancestor. Also, ‘On the Origin of Species’ (published in 1859) only mentions human evolution in passing, for two reasons: Darwin was wary of the response (‘Vestiges of Creation’ in 1844 had met with controversy), and there wasn’t enough evidence available at the time to make a detailed analysis of human evolution. That said, Darwin’s book brought about a classic paradigm shift; never again could man look at the natural world around him the same way (or himself, for that matter). As for Darwin, over the years his religious beliefs had eroded. By 1859, Darwin considered all religions equally valid, and was critical of the Biblical account of creation. The death of his daughter Anne in 1851 at age 10 had also contributed to his loss of faith, and he stopped attending church entirely (though he never quite became a total atheist).