One of the physicists that worked on Quantum Mechanics in the 1920s and 1930s. He is Danish and lived in Copenhagen. He is most popularly known for his interpretation of Quantum Mechanics that came to be called the Copenhagen Interpretation (which Einstein strongly opposed).During WW2 following the Nazi invasion of Denmark, he nearly died in a unpressurized part of a British bomber from lack of oxygen, even though he was given an oxygen mask and bottle, when the mask came loose from his large head and he blacked out before he could put it back.