Scientists Discover a Substance that Appears Cold When You Heat it Up

The hotter an object gets, the more heat it radiates. Simple, right? It's a fundamental physical principle that makes instruments like infrared goggles possible. But now researchers at Harvard have identified a material that defies this principle by actually appearing colder as it warms up. » 10/28/13 8:45am 10/28/13 8:45am