Today we mark the anniversary of its publication (24/11/1859 ) by the British scientist Charles Darwin The Origin of Species:
The Origin of Species By Means of Natural Selection or the Preservation of Favoured Races in the Struggle For Life
The Origin of Species by means of natural selection or the preservation of favoured races in the struggle for life.
With the exception of a few lecturers at the university, I estimate that I have never met people who have read the book*, but its immense influence is evident in our lives and it is still considered the foundation of modern evolutionary theory.
For those interested: The Origin of Species - The first edition
A quick search on the web can find many additional sources, including:
The Complete Work of Charles Darwin Online
Discovering  The Origins Of Charles Darwin

* "A classic is something everyone wants to read but nobody has read." Mark Twain