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RE: NATURE INSPIRED INVENTIONS --- Sonar System; and I measured the depth of the sea. It was on my Mark Twain!
Well, if you have any references to submarines transporting troops before WWII (not spies), then I'll be happy to learn :) And BTW, first successful submarine attack took place during American Civil War, so they were invented a bit earlier then WWI.
You have a valid point there.. I stand corrected.. Am glad you shared your knowledge with me.