spindle

They estimate 14 million. (I would have said "over 10 million" to avoid spurious precision.) This makes me happy!

INTERCAL

This is lovely.

I'm having trouble working out how this differs from Factor, in which left bracket and quote are also not primitive.

Many congratulations on being formally proved right, Randall!

stderr

Fred Hoyle, "The Black Cloud"

and I wish someone cleverer than me would read Nick Harkaway's "Gnomon" and then explain it to me.

Not enough of them do, I agree, but some of the Modern Monetary Theory people do. E.g. Mark Blyth (some very entertaining talks on youtube), Stephanie Kelton. Also political economists do and always have, I believe. (IANAE, and in fact I'm not certain that Mark Blyth is an MMT person, but I thought I'd get the ball rolling.)

TCL is kinda similar to Rebol in some ways but in other ways it's the opposite of Rebol, because in TCL everything is a string (although it can ALSO have another type, thanks to clever shenanigans). (You probably knew this!)