What town is closest to the castle once owned by the Scottish inventor who invented a military cannon described by Isaac Newton as "destructive to the human species"?
David Gregory (physician): David Gregory (20 December 1625 – 1720) was a Scottish physician and inventor. Kinnairdy Castle: Kinnairdy Castle is a tower house, having five storeys and a garret, two miles south of Aberchirder, Aberdeenshire, Scotland. Kinnairdy Castle:  The alternative name is Old Kinnairdy.
i don't know