A waterproof raincoat, or a variety of red apple, also the former name of Apple's computer operating system.
Named after Charles Macintosh, the Scottish chemist who invented waterproof fabric in 1824 by cementing layers of cloth with rubber solution. The apple variety was named after John McIntosh who discovered it in Canada in 1811.
The Macintosh apple's discovery was pure accident - John McIntosh found seedlings while clearing land in Ontario, and one became the parent of all McIntosh apples worldwide. Apple Computer's choice of this name was both a play on 'Mac' being friendly and approachable, and a nod to the company's creative, non-corporate image.
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