Which is really ironic because flush toilets were normal in Indus valley civilization. That would be 2500 BC or another 500 years earlier. Centuries ahead of its time<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Sanitation_of_the_Indus_Valley_Civilisation" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Sanitation_of_the_Indus_Valley...</a>