20th-century atheists

Linus Carl Pauling ( PAW-ling; February 28, 1901 – August 19, 1994) was an American chemist, biochemist, chemical engineer, peace activist, author, and educator. He published more than 1,200 papers and books, of which about 850 dealt with scientific topics. New Scientist called him one of the 20 greatest scientists of all time. For his scientific work, Pauling was awarded the Nobel Prize in Chemistry in 1954. For his peace activism, he was awarded the Nobel Peace Prize in 1962. He is one of five people to have won more than one Nobel Prize (the others being Marie Curie, John Bardeen, Frederick Sanger, and Karl Barry Sharpless). Of these, he is the only person to have been awarded two unshared Nobel Prizes, and one of two people to be awarded Nobel Prizes in different fields, the other being Marie Curie.Pauling was one of the founders of the fields of quantum chemistry and molecular biology. His contributions to the theory of the chemical bond include the concept of orbital hybridisation and the first accurate scale of electronegativities of the elements. Pauling also worked on the structures of biological molecules, and showed the importance of the alpha helix and beta sheet in protein secondary structure. Pauling's approach combined methods and results from X-ray crystallography, molecular model building, and quantum chemistry. His discoveries inspired the work of Rosalind Franklin, James Watson, Francis Crick, and Maurice Wilkins on the structure of DNA, which in turn made it possible for geneticists to crack the DNA code of all organisms.In his later years, he promoted nuclear disarmament, as well as orthomolecular medicine, megavitamin therapy, and dietary supplements, especially ascorbic acid (commonly known as Vitamin C). None of his ideas concerning the medical usefulness of large doses of vitamins have gained much acceptance in the mainstream scientific community. He was married to the American human rights activist Ava Helen Pauling.

Giosuè Alessandro Giuseppe Carducci (Italian: [dʒozuˈɛ kkarˈduttʃi]; 27 July 1835 – 16 February 1907) was an Italian poet, writer, literary critic and teacher. He was noticeably influential, and was regarded as the official national poet of modern Italy. In 1906, he became the first Italian to receive the Nobel Prize in Literature. The Swedish Academy's motivation was that "not only in consideration of his deep learning and critical research, but above all as a tribute to the creative energy, freshness of style, and lyrical force which characterize his poetic masterpieces."

Piergiorgio Odifreddi (born 13 July 1950, in Cuneo) is an Italian mathematician, logician, student of the history of science, and popular science writer and essayist, especially on philosophical atheism as a member of the Italian Union of Rationalist Atheists and Agnostics. He is philosophically and politically near to Bertrand Russell and Noam Chomsky.

John Anderson (1 November 1893 – 6 July 1962) was a Scottish philosopher who occupied the post of Challis Professor of Philosophy at Sydney University from 1927 to 1958. He founded the empirical brand of philosophy known as Australian realism.
Anderson's promotion of 'freethought' in all subjects, including politics and morality, was controversial and brought him into constant conflict with the august senate of the university. However, he is credited with educating a generation of influential 'Andersonian' thinkers and activists—some of whom helped to place Sydney in the forefront of the 'sexual revolution' of the 1950s and 1960s.
To Anderson, an acceptable philosophy must have significant 'sweep' and be capable of challenging and moulding ideas in every aspect of intellect and society.

Charles-Auguste Bontemps (February 9, 1893 – October 14, 1981) was a French individualist anarchist, pacifist, freethinker and naturist activist and writer.

Etienne Vermeersch (2 May 1934, Sint-Michiels, Bruges – 18 January 2019, Ghent) was a Belgian moral philosopher, skeptic, opinion maker and debater. He is one of the founding fathers of the abortion, euthanasia law, and the Law on Patients' Rights in Belgium. Vermeersch became an atheist after five years with the Society of Jesus (Jesuits). Later he became a philosophical materialist. In January 2008, Vermeersch was chosen by hundred prominent Flemings as the most influential intellectual of Flanders. He died in a hospital in Ghent on 18 January 2019 by euthanasia after a long illness.

Donald Carl Johanson (born June 28, 1943) is an American paleoanthropologist. He is known for discovering, with Yves Coppens and Maurice Taieb, the fossil of a female hominin australopithecine known as "Lucy" in the Afar Triangle region of Hadar, Ethiopia.