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Dr. Chris Van de Walle (left) and Dr. Jörg Neugebauer (right) discussing the physics of hydrogen at the Fritz-Haber-Institut, Berlin ((photo and text: C G Van de Walle and J Neugbauer 2003)

Dr. Chris Van de Walle (left) and Dr. Jörg Neugebauer (right) discussing the physics of hydrogen at the Fritz-Haber-Institut, Berlin ((photo and text: C G Van de Walle and J Neugbauer 2003)