CALIFORNIA, United States (Reuters) —  Scientists in California have created rewritable paper, printed using light instead of ink, that can be erased and reused up to 80 times. In the United States alone, about 70 million tons (63.5 million metric tons) of paper and paperboard are used each year, with more than 350 million magazines and 24 billion newspapers published, according to the US Environmental Protection Agency. The chemists at the University of California, Riverside, […]