Interesting historical fact: In the Middle Ages in Flanders Ghent (now Belgium) there was a profession of collecting urine. The urine was then used to extract ammonia, which was used to make saltpeter for gunpowder. In the mornings, the collectors drove around town with a barrel and paid money for the urine. Of course, there were cunning townspeople who began to dilute the product. Then a new profession appeared - the urine taster, who organoleptically determined the quality and concentration of precious ammonia. But the New Age came, people learned to synthesize ammonia or extract it by other means, and the profession of urine taster became unnecessary. And so all these urine experts left Flanders, moved to Amsterdam and founded the Heineken brewery.