Stone tablets were one of the earliest writing tools used by man before paper. One entrepreneur now plans to take things full circle by making paper out of stone.
Nobuyoshi Yamasaki's venture TBM Co. makes paper from limestone, a rock it proclaims is "almost inexhaustible." He says it's the answer to concerns over deforestation and water shortages, with world demand for paper set to double by 2030.
"I want to end my life as an entrepreneur by creating a company that will last for hundreds of years," says Yamasaki, a former used car salesman who left school at 15 and began his career as a carpenter.