Who died in June 1925

The 9th Prime Minister of Norway who led the nation to independence from Sweden in 1905

German mathematician, educator, and historian known for his Erlangen Program, which unified geometries by their symmetry groups, and for his work in complex analysis and non-Euclidean geometry

French astronomer and author who explored the cosmos through popular science, early science fiction, and psychical research

American Vice President and Indiana Governor known for his wit, his role during Wilson's incapacitation, and the famous 'five-cent cigar' quote