The History of Terrorism
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Education
Educational organizations
National academies
USSR Academies
USSR Academy of Sciences
Foreign Members of the USSR Academy of Sciences
Georges Urbain
Celtium
Hafnium (Hf)
Parents
Celtium
Chemical elements
Chemical elements predicted by Dmitri Mendeleev
Dirk Coster
George de Hevesy
Neutron poisons
Transition metals
Children
Hafnium (Chinese hacking group)