Most food-wrap films just act as a barrier to bacteria, but don't actually kill the microbes. An experimental new film does exactly that, plus it changes color to show when food is spoiled. And what's ...
Dr. Mark Lindsay was 5 years old when he first learned that tree trunks were brown. "Up until that point, I believed leaves and trunks were all green. Just lighter and darker shades," Mark said. Mark ...
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