Every year on Darwin's birthday, I like to repost/update my essay explaining evolution and the evidence for it. Darwin's theory of evolution has been one of the most robust theories in science. With some modifications, it is still the basis of our understanding of most of biology. Every Feb 12th (Darwin's Birthday) I post an article or series of articles discussing evolution and the evidence for Darwin's theory.

Darwin's theory grew out of an era when a considerable amount of careful observation from around the world was beginning to be formulated into careful scientific ideas. Not all ideas from this era were equally scientific, nor equally valid. Charles Darwin's theory was formulated based on a huge amount of observation both personally made by Darwin and made by correspondents he wrote to from all over the world. It took many years for Darwin to put his ideas into words and his book, Origin of Species, spends a great deal of time addressing criticisms of the theory of Evolution. When Darwin formulated his theory, the Mendelian rules of genetics were unknown, and DNA wasn't even conceived of. So, in essence, the mechanisms and rules that govern evolution were unknown. Darwin defined the patterns of how living things changed and competed, and it was only later that those mechanisms were discovered, giving the statistical and molecular context for Darwin's theory. Those later discoveries have only strengthened Darwin's theory, never contradicting his ideas.  read more »