Creating a pen and ink at school usually meant making stink bombs that stank of rotten eggs during chemistry lessons by mixing ammonia sulphide, vinegar and bicarbonate of soda. It was all a bit of fun that even teachers found funny, even if they tried to hide it, but such a dreadful stink was originally invented as a weapon, and you’re about to be surprised, by that man again, the one and only Leonardo da Vinci. The ‘stink bombs’ he invented, yes da Vinci invented the stink bomb, were tied to the heads of arrows when in battle to make the enemy surrender rather than die of asphyxiation. Oh well, I suppose it was better to suffer a bad smell than to cop an arrow in the eye like King Harold.
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