title: Geophysics. Helium feels the heat in Earth's mantle.
authors.affiliation: Laboratoire des Sciences de la Terre, Ecole Normale Supérieure de Lyon, 46 Allee d'Italie, 69364 Lyon Cedex 7, France. francis.albarede@ens-lyon.fr
authors.forename: Francis
authors.initials: F
authors.lastname: Albarède