image: Diamonds from the Juina area, Brazil. This material relates to a paper that appeared in the August 16, 2019, issue of Science, published by AAAS. The paper, by S. Timmerman at Australian National University in Acton, ACT, Australia, and colleagues was titled, "Primordial and recycled helium isotope signatures in the mantle transition zone." view more
Credit: Graham Pearson