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TODAY, June 13, is the 120th birth anniversary of National Scientist Casimiro del Rosario. Known as the Dean of Filipino Physicists, he is recognized nationally and internationally for his works and achievements in the fields of physics, astronomy and meteorology. He was conferred the title of National Scientist in May 1982. Del Rosario died on Sept. 15, 1982. Marielle Medina, Inquirer Research