In 2015, researchers discovered a lot of things about the Earth. Some of of those findings were good news, others not so good. Other discoveries simply gave us a better understanding of how our world works. Here are some of those revelations.
Researchers at University of Illinois and Nanjing University in China found that what was previously thought to be the Earth's inner core, which consists of iron crystals aligned in a north-south direction, has yet another core inside it, this one with crystals aligned east-west.