Candidate of Sciences in the context of International Standard Classification of Education

A Doctor of Sciences is a higher doctoral degree that was awarded in the Russian Empire, the Soviet Union and many Commonwealth of Independent States countries. It is currently awarded in some post-soviet nations, particularly Russia and Belarus. One of the prerequisites for receiving a Doctor of Sciences degree is obtaining a PhD-equivalent Candidate of Sciences degree. In addition, the Doctor of Sciences conferral also requires applicants to demonstrate significant and outstanding contributions to their research field. This degree is generally regarded as recognition for a lifetime of academic achievements rather than an ordinary academic degree achieved through courses and theses.
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Yuri Nikolayevich Babayev (Russian: Юрий Николаевич Бабаев; 21 May 1928 – 6 October 1986), k.N, was a Soviet physicist who spent a long career in the former Soviet program of nuclear weapons, and known as one of the principles who designed the Tsar Bomba, the largest-ever nuclear weapon.