I am grateful to Janne Blichert-Toft who invited me to write this volume. Without her encouragement and advice, I am not sure it would have come to completion in a reasonable interval of time. Confinement also helped!
Science can be a solitary existence but most of the time it is a group effort. I had the good luck of benefitting from guidance and collaborations with great scientists, among them, Minoru Ozima, Yuji Sano, Igor Tolstikhin, Marc Javoy, Keith O’Nions, Chris Ballentine, Francis Albarède, Rainer Wieler, François Robert, and Albert Jambon. I enjoyed the vibrant atmosphere of research at the CRPG...
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