I was reminded of this thread.
Actionable information is here:
?t=224.
I read (in the 1970s) that rammed earth floors were amended with oxblood, and now it turns out the secret sauce is
Serum_albumin so it wasn't just to color the floor dark brown.
The guy ahead of me in line at the credit union was getting a rent check that was 2.5x what I pay, and he complained to the teller that it was going to be worse in five years. As he walked away I told him in five years we can all be living in 3D printed mud bubbles made from the dirt that was in the hole they are in. ...and we'd be happier.