In the past, also, war was one of the main instruments by which human societies were kept in touch with physical reality.
(...)
In philosophy, or religion, or ethics, or politics, two and two might make five, but when one was designing a gun or an aeroplane they had to make four.
-- George Orwell, 1984
Well, I don't know. The sort of gun you had before modern precision machining, 4.2 would be good enough, maybe 4.3 at a pinch.
Take off every 'quote'! You know what you doing. For great insight. Move 'quote'.
And if you don't: