When I was a kid growing up in Lincoln, Nebraska, they were placing a 
lot of concrete for the new houses and streets going into the next 
neighborhood. Concrete: I thought of it as "liquid stone" and wondered, 
"how do they do that." I still go back to see the edge of the city 
sidewalk  where I printed my initials and embedded a buffalo nickel in 
the wet concrete. After half a century both are still there.

Be sure to have some kids there right after the concrete placement to 
etch their initials in the liquid stone. When I was in Atlanta last 
month one of the carpenters handed me a newly minted nickel that had a 
buffalo on it!

--
To terminate puerile preservation prattling among pals and the
uncoffee-ed, or to change your settings, go to:
<http://listserv.icors.org/archives/bullamanka-pinheads.html>