How often per day do we use something without giving it a second thought? Take our daily use of paper. We scribble a note on pieces of papera note to our future self or to a loved one, a shopping list, a website address or phone number, a sketch while making a calland then it ends up in the waste bin. We pay with banknotes for our groceries at the local market, and our groceries are packed in paper bags. We read the news in the papers. Yesterday's