I wonder if this was the secret ingredient of the Roman concrete that people keep talking about, the lost recipe.
"New Concrete: strong as shit."
Does it have to be human poop?
It looks like they are mixing charcoal made from poop, so I guess anything that can be charcoaled is fine.
The human part is probably to get additional grants.
Year 3026: "Ewwwwwwwww!"
“Shit a brick” got real
And 100% smellier.