Over the past decade or so, it has become increasingly common to hear the phrase “transformative science” in various contexts. In reality, the number of scientific results that are truly transformative are relatively few. (After all, how often can our fields be transformed?) Today, it is my pleasure to be introducing Motohiko Murakami, a young scientist whose work has fundamentally changed the way we think of the Earth’s lower mantle, and especially the few hundred kilometers just above the core-mantle boundary: the D′′ region.

In 2004, Motohiko published a paper with his Ph.D. thesis advisor Kei Hirose, N. Sata, and...

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