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On 14 May 1856, Charles Darwin recorded in his journal that, on the advice of his friend Charles Lyell, after almost 20 years exploring the subject, he had finally begun writing a ‘sketch’ of his ideas on species.
On 20th February 1835, while taking a rest in a wood in Valvidia, Southern Chile, Charles Darwin experienced a major earthquake.
On 10th January 1860, Charles Darwin wrote to his good friend the geologist Charles Lyell, humorously describing mankind’s ancestor.
In 1841, Darwin's ill-health evidently left him with low expectations of his future ability to contribute to science.