Marian Danysz lived from 1909 to 1983. He was Polish physicist and professor at University of Warsaw. He co-discovered hypernucleus with Jerzy Pniewski in 1952. Hypernucleus contains proton neutron and lambda hyperon Λ0. In 1962 they found hypernucleus in excited state. In 1963 they discovered hypernucleus with two lambda baryons. He was son of physicist Jan Kazimierz Danysz.