And Endless Forms at the Fitzwilliam Museum, in Cambridge, considers how Darwin's ideas penetrated the consciousness of the great artists of the era, inspiring visual representations of the struggle for existence, of natural attraction and sexual selection, and the origin and descent of man.

BBC: Friday 11 September: Darwin special

And so I sort of vowed as I went into my 20s to try to do that for all the other kids out there like me, who had been looking for documents of that kind of existence and for that kind of struggle.

NPR: Remembering the Crack Epidemic