*ducks*
Primer is brilliant, but it does have its technobabble moments (as close as I can remember it):
"Come on, what's the variable you can always change, in mechanics, in the Feynman diagrams without changing anything?"
"Time."
(putting pedant hat on)
While this is accurate (most classical, and for that matter quantum theories are invariant under time reversal), this isn't true for weak interactions or thermodynamics, for example. Also, it struck me at the time as something real people, real physicists wouldn't say. They would just say "it's gone backward in time".
Still, this is unbelievable nitpicking. Primer was wonderful and thoughtprovoking, and I hope Daemon is if and when I read it.
1) Doctors appreciate organ doners.
Sometimes after a late night at the brain lab, what you really need is a kebab.
I have hardly ever known a mathematician who was capable of reasoning. -- Plato