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Masatoshi Koshiba, the renowned Japanese physicist and Nobel laureate in Physics in 2002 for his work in detecting cosmic neutrinos from a supernova, passed away in 2020. Koshiba's groundbreaking experiments at the Kamiokande and Super-Kamiokande observatories revolutionized our understanding of the universe and its most enigmatic phenomena, providing valuable insights into the fundamental properties of subatomic particles and the cosmos.