Weird mystery waves that baffle scientists may be 'everywhere' inside Earth's mantle 

 Structures that scatter seismic waves deep in Earth's mantle seem to be everywhere researchers look. 

https://cdn.mos.cms.futurecdn.net/Cqdb6F6aCW4v2WwV4q39tg.jpg

https://www.space.com/mystery-waves-earth-mantle