Your friend saw this resource on bethinking.org and thought you should see it:
Dr Who - More to Learn
A sample chapter from
Back in Time: A thinking fan's guide to Doctor Who.
See the full resource online by visiting bethinking.org:
https://www.bethinking.org/culture/dr-who-more-to-learn
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bethinking.org is a collection of resources which aims to make sense of the big questions of life about God, Jesus and Christianity.