Patrick Ness: Why I wrote A Monster Calls
https://www.bbc.com/news/entertainment-arts-14308543
How Ness came to write a novel inspired by Siobhan Dowd's idea after she prematurely passed away from cancer.
Patrick Ness Interview 2 -
https://www.bbc.co.uk/sounds/play/p00yhhyd
Patrick Ness discussing writing A Monster Calls
Pacific Yew: Tree of Death or Tree of Life?…or Both?
https://sites.evergreen.edu/plantchemeco/taxus-brevifolia/
How the yew tree went from deadly to medicinal
Britain's ancient yews: mystical, magnificent – and unprotected
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