title: GEOPHYSICS: Enhanced: Earth's Enigmatic Interface.
abstract: At the boundary between Earth's mantle and its core, physical properties such as density change dramatically. In their Perspective, Garnero and Jeanloz discuss the competing models of this boundary's structure. Distinguishing between the models will require more high-quality seismic data.
authors.forename: E J
authors.initials: EJ
authors.lastname: Garnero
authors.forename: R
authors.initials: R
authors.lastname: Jeanloz