What lies deep in the mantle below? - Foulger, Gillian; Panza, Giuliano; Artemieva, Irina; Bastow, Ian; Cammarano, Fabio; Doglioni, Carlo; Evans, John; Hamilton, Warren; Julian, Bruce; Lustrino, Michele; Thybo, Hans; Yanovskaya, Tatiana (Eos, Earth and Space Science News, 2015)