books.google.fr - Half a million years ago our ancestors learned to make fire from scratch. They crafted intricate tools from stone and brewed mind-altering elixirs from honey. Their descendants transformed clay into pottery, wool into clothing, and ashes into cleansers. In ceramic crucibles they won metal from rock,...http://books.google.fr/books/about/Caveman_Chemistry.html?hl=fr&id=JOtJKgWkPuQC&utm_source=gb-gplus-shareCaveman Chemistry
