The Naked Scientists Podcast - What the Earth Can Teach Us

This week we look at what the earth can teach us about itself. The idea of using vibrations to map out the inside of the earth isn't just useful to find out the earth's structure, but to also see when that structure is changing. A recent story came out with the alarming sounding claim that the earth's core might be slowing down or even reversing. So are we in any danger? I spoke to University of Southern California's John Vidaly.