Are We in Any Danger?

Vibrations from earthquakes can be used to map the Earth's structure. The idea of using vibrations to map out the inside of the Earth isn't just useful for finding out how our planet operates, but also when it 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.