Even worse, the villagers were convinced that he was possessed by an evil spirit.
But he did not give up until he discovered the mystery of the material used to make sanitary napkin. He then wrote a letter to the big manufacturing companies to ask about the material used to manufacture it.
A few weeks later, mysterious hard boards appeared in the mail - cellulose, from the bark of a tree. It had taken two years and three months to discover what sanitary pads are made of, but there was a snag - the machine required to break this material down and turn it into pads cost many thousands of dollars.
