"I spent my time investigating insects. At the beginning, I started with silk worms in my home town of Frankfurt. I realized that other caterpillars produced beautiful butterflies or moths, and that silkworms did the same. This led me to collect all the caterpillars I could find in order to see how they changed."

Completing her doctoral research in 1905, Meitner became the second woman from the University of Vienna to earn a doctorate in physics. She spent most of her scientific career in Berlin, Germany, where she was a physics professor and a department head at the Kaiser Wilhelm Institute; she was the first woman to become a full professor of physics in Germany. She lost these positions in the 1930s because of the anti-Jewish Nuremberg Laws of Nazi Germany, and in 1938 she fled to Sweden, where she lived for many years, ultimately becoming a Swedish citizen.

In mid-1938, Meitner with chemists Otto Hahn and Fritz Strassmann at the Kaiser Wilhelm Institute found that bombarding thorium with neutrons produced different isotopes. Hahn and Strassmann later in the year showed that isotopes of barium could be formed by bombardment of uranium. In late December, Meitner and Frisch worked out the physics of such a splitting process. In their report in February issue of Nature in 1939, they gave it the name "fission". This principle led to the development of the first atomic bomb during World War II, and subsequently other nuclear weapons and nuclear reactors.

Meitner did not share the 1944 Nobel Prize in Chemistry for nuclear fission, which was awarded exclusively to her long-time collaborator Otto Hahn. Several scientists and journalists have called her exclusion "unjust". According to the Nobel Prize archive, she was nominated 19 times for the Nobel Prize in Chemistry between 1924 and 1948, and 30 times for the Nobel Prize in Physics between 1937 and 1967. Despite not having been awarded the Nobel Prize, Meitner was invited to attend the Lindau Nobel Laureate Meeting in 1962. She received many other honours, including the naming of chemical element 109 meitnerium in 1997 after her death.

Davis was born in Birmingham, Alabama; she studied at Brandeis University and the University of Frankfurt. She also studied at the University of California, San Diego, before moving to East Germany, where she completed some studies for a doctorate at the Humboldt-University of Berlin. After returning to the United States, she joined the CPUSA and became involved in the second-wave feminist movement and the campaign against the Vietnam War.

In 1969, she was hired as an assistant professor of philosophy at the University of California, Los Angeles (UCLA). UCLA's governing Board of Regents soon fired her due to her membership in the CPUSA. After a court ruled the firing illegal, the university fired her for the use of inflammatory language. In 1970, guns belonging to Davis were used in an armed takeover of a courtroom in Marin County, California, in which four people were killed. Prosecuted for three capital felonies—including conspiracy to murder—she was held in jail for more than a year before being acquitted of all charges in 1972.

During the 1980s, Davis was twice the Communist Party's candidate for the Vice President of the United States. In 1997, she co-founded Critical Resistance, an organization working to abolish the prison–industrial complex. In 1991, amid the dissolution of the Soviet Union, she broke away from the CPUSA to help establish the CCDS. That same year, she joined the feminist studies department at the University of California, Santa Cruz, where she became department director before retiring in 2008.

She was the first woman to win a Nobel Prize, the first person to win a Nobel Prize twice, and the only person to win a Nobel Prize in two different scientific fields. Marie and Pierre were the first married couple to win the Nobel Prize and launching the Curie family legacy of five Nobel Prizes. She was, in 1906, the first woman to become a professor at the University of Paris.^[5]

She was born in Warsaw, in what was then the Kingdom of Poland, part of the Russian Empire. She studied at Warsaw's clandestine Flying University and began her practical scientific training in Warsaw. In 1891, aged 24, she followed her elder sister Bronisława to study in Paris, where she earned her higher degrees and conducted her subsequent scientific work. In 1895, she married Pierre Curie, with whom she conducted pioneering research on radioactivity—a term she coined.^[6][7] In 1906, Pierre died in a Paris street accident.

Under her direction, the world's first studies were conducted into the treatment of neoplasms by the use of radioactive isotopes. She founded the Curie Institute in Paris in 1920, and the Curie Institute in Warsaw in 1932; both remain major medical research centres. During World War I, she developed mobile radiography units to provide X-ray services to field hospitals.

While a French citizen, Marie Skłodowska Curie, who used both surnames,^[8][9] never lost her sense of Polish identity. She taught her daughters the Polish language and took them on visits to Poland.^[10] She named the first chemical element she and Pierre discovered polonium, after her native country.^[b]

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