Scientists at a research lab in Japan have produced a paper-based material that could be an ideal replacement for those single-use plastics. A cup made from the transparent material could hold just-boiled water for over 3 hours with no leakage. When the researchers coated the cup with a plant-derived fatty acid salt, it became completely waterproof. To test the degradability of the material in case of accidental release into the ocean, the researchers submerged paperboard sheets at sites...