From the podcast of Ockham’s Razor (A[ustralian]BC Radio National):
Emeritus Professor Anthony Larkum from Sydney University talks about what launched Charles Darwin into a scientific career at Cambridge and how he was given the opportunity to go on the HMS Beagle.
Larkum is the author of A Natural Calling: Life, Letters and Diaries of Charles Darwin and William Darwin Fox
The Dispersal of Darwin 
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“. . . the lad seemed nothing more than a wayward pisspot.” Hey, I am just like Darwin.
What a wonderful thing!