In July 1837, Charles Darwin was a young man of 28. At his home in London, he wrote at the top of the page of one of his red leather notebooks, "I think". Then he drew a spindly sketch of a tree.

Charles Darwin: Why do we find different kinds of birds and animals in different parts of the world? Scherrikar Bell: He did some research, made some observations and drew some drawings of birds.

Notebooks written by Charles Darwin, which were mysteriously returned ... They include his famous Tree of Life sketch exploring the evolutionary relationship between species.

The development of Charles Darwin's views on evolution by natural selection has fascinated biologists ... While his autobiography claims that the framework of his theory was laid down by 1839, its ...

Charles Darwin's theory of evolution by natural selection made us rethink our place in the world. The idea that humans shared a common ancestor with apes was a challenge to the foundations of ...

Charles Darwin's “Tree of Life” sketch is seen on a page of “Notebook B,” one of the trove of Darwin documents that had been stored in the Cambridge University library Two of Charles ...