Very cool, if true

Also, audience size.

I think the audience for hard physical science fiction is smaller than the audience for a programme that pokes around in the social impacts of science and has science-fictional adventures. I think the audience for hard scify about time travel is probably smaller the audience for hard scify generally.

Lots of people want an adventure that often poses questions about how we organise society. Fewer people want to spend their Sunday night thinking about Grandfather Paradoxes.