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Scissortank
Since: Jun, 2018
Medinoc
(Before Recorded History)

This was a paperback sci-fi novel. I think it was a lesser title by a famous author.
The part I remember was a boy at the doctor's office. He'd been injured, and his clotted blood was distinctly nonhuman due to some secret alien mumbo jumbo. The doctor wondered if this kid was dumb enough to seal his cut with modelling cement.
The language was old-fashioned, but I couldn't tell you what era it came from.