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159 years ago today, On the Origin of Species by Charles Darwin was published for the first time. It is, to my mind, the most revolutionary, and the most important book ever written. 
After an epic journey on the Beagle, years of meticulous thought and experimentation, and prompted by Alfred Wallace coming to roughly the same idea, Darwin compiled his thoughts on the radiation of species in this book.
And the process by which the diversification of life on Earth had occurred over generational and geological time.
