Two "stolen" notebooks written by Charles Darwin have been mysteriously ... Cambridge University Library The tree of life sketch was central to developing Darwin's theory of evolution The notepads ...

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.

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 ...