Link:
Question: What is a greatest invention on the human history?
Answer: Quern
Before to speak for Quern, I refered to www site. But all were an old story. I want to talk in a near future.
In site:http://www.keystothepast.info/durhamcc/K2P.nsf/K2PGlossary?readform&GLOSSARY=quern, I find a following description: I think that is a dwarished appraisal for quern stones. For the sake of too common, quern stones was out of the question to think. I think we must restore the honor.
Glossary
"Quern; Quern stones
Querns are simple carved stones used to grind stone to make corn. The oldest
type is known as a saddle quern. These have a larger slab of stone as the base.
The corn is the placed on the slab, and a smaller stone is used to grind the
corn. It is called a saddle stone because the base slab becomes ground away
in the centre making it appear a little like a saddle. These usually date to
the prehistoric period. The other main type of quern is the rotary quern. This
is made up of two circular pieces of stone with a hole through them. A small
wooden handle is usually placed in the top one slightly off-centre. This is
then used to rotate the top stone against the bottom one. Corn is fed through
the central hole. "
http://www.atkinsonmilling.com/history.htm : Brief History of Mill 1757 Until Now.
http://www.bigai.ne.jp/~miwa/miwa/e_implement.html : This is my paper for for "The History of Grinding Implements for the Domestic Use in Japan "
http://www.angelfire.com/journal/millrestoration/history.html: The History of Flour Milling in Early America