In the shed beside the École de Physique et Chimie, the air was damp and thin, yet Marie Curie bent over her instruments as if the whole future of science depended on a single reading. By 1898 she and Pierre were weighing pitchblende, grinding ore, and watching the electrometer answer with numbers that should not have been possible. The ore was four times as active as uranium itself. That fact had driven her here, and it would drive her farther still, into the naming of polonium in July 1898 and radium on 26 December 1898. She was not merely observing a curiosity. She was proving that something hidden in matter was speaking back. CHAPTER: Warsaw Beginnings To understand that moment, one must go back to Warsaw on 7 November 1867, to the fifth and youngest child of Władysław Skłodowski and Bronisława, née Boguska. Maria Salomea Skłodowska, nicknamed Mania, grew up in a house marked by loss and learning. Her family had been stripped of property after patriotic involvement in the January Uprising, and her father, a teacher of mathematics and physics, brought laboratory equipment home when Russian authorities removed practical instruction from schools. Her mother ran a girls' boarding school until Maria was born, and died of tuberculosis in May 1878. Maria was ten then, and the death of her sister Zofia before that had already sharpened the family grief. CHAPTER: Schoolgirl and Agnostic At J. Sikorska's boarding school and then the girls' gymnasium, Maria proved dazzlingly capable, graduating on 12 June 1883 with a gold medal. Yet the next year brought a collapse, perhaps from depression, and she withdrew to the countryside before returning to Warsaw to tutor. The Russian Empire would not permit a woman into normal higher education, so she and her sister Bronisława entered the clandestine Flying University, a patriotic institution that admitted women. The deaths of her mother and sister had already loosened her from Catholic faith, and she became agnostic. The discipline of study remained, but it now belonged to her alone. CHAPTER: The Sister's Pact Maria and Bronisława made an agreement as practical as it was loving. Maria would support Bronisława's medical studies in Paris, and two years later Bronisława would help Maria. So Maria became a home tutor in Warsaw, then a governess in Szczuki with the Żorawski family, relatives of her father. There, while teaching and studying in stolen hours, she fell in love with Kazimierz Żorawski, the family's son and a future mathematician. His parents rejected the match because she was penniless, and he could not defy them. The loss cut deeply, though Kazimierz later became professor and rector of Kraków University. Maria, meanwhile, kept to her bargain and kept saving. CHAPTER: Paris in 1891 In late 1891, aged 24, she finally left Poland for France. Paris did not greet her with comfort. She lived first with Bronisława and her husband Kazimierz Dłuski, then rented a garret in the Latin Quarter, closer to the University of Paris. There she studied physics, chemistry, and mathematics, surviving on meagre means and often wearing all her clothes to keep warm through the winters. She forgot to eat because the work held her so completely. By 1893 she had earned a degree in physics, and in 1894 a second degree, supported by a fellowship. She also began research for the Society for the Encouragement of National Industry, studying the magnetic properties of steels. CHAPTER: Pierre and the Laboratory That same year, Pierre Curie entered her life through science. He taught at the City of Paris Industrial Physics and Chemistry Higher Educational Institution, and Józef Wierusz-Kowalski, the Polish physicist, introduced them because Marie needed space to work. Pierre had little room, but enough to help. Their friendship deepened into love, and then into a partnership of mind and purpose. He proposed marriage, but she hesitated, still imagining a return to Poland. Pierre answered by saying he would follow her even if it meant teaching French. In the summer of 1894 she returned to Warsaw, only to be refused a place at Kraków University because she was a woman. Pierre's letters drew her back to Paris and towards a PhD. CHAPTER: Marriage at Sceaux Before the wedding, Pierre wrote up his magnetism research and took his doctorate in March 1895, then became a professor. On 26 July 1895, they married in Sceaux without a religious service. Marie wore dark blue instead of a bridal gown, and that same practical outfit served later as a laboratory garment. They travelled by bicycle and took journeys abroad, sharing the simple pleasures that matched their fierce devotion to work. By then, Marie was not merely Pierre's wife. She was his collaborator, and in the public eye a quip would later call her Pierre's biggest discovery. Yet the truth was stronger than the joke. They were about to change physics together. CHAPTER: Rays from Uranium In 1895 Wilhelm Röntgen discovered X-rays, and in 1896 Henri Becquerel found that uranium salts emitted rays of similar power. Marie saw in these discoveries a thesis topic and a challenge. Using Pierre's electrometer, she showed that uranium rays caused air around a sample to conduct electricity, and she found that the activity of uranium compounds depended only on the amount of uranium present. From that she drew a bold conclusion: the radiation must arise from the atom itself. That idea cut against the old belief that atoms were indivisible. It was a precise thought, not a vague hunch, and it placed her among the founders of the modern understanding of matter. CHAPTER: Pitchblende and Polonium In 1897 her daughter Irène was born, and Marie began teaching at the École normale supérieure to support the household. The Curies worked in a converted shed beside ESPCI, once a dissecting room, badly ventilated and not even waterproof. They did not know the harm that radiation would cause. With pitchblende and torbernite, Marie found something startling. Pitchblende was four times as active as uranium; torbernite twice. If uranium's activity depended on its quantity, then these ores must contain an even more active substance. She also discovered in 1898 that thorium was radioactive. On 12 April 1898, Gabriel Lippmann presented her first brief paper to the Académie des Sciences. In July, she and Pierre announced polonium, named for Poland, and on 26 December radium, named from the Latin for ray. CHAPTER: Tonnes of Ore Discovery was one thing. Proof was another. Pitchblende was a complicated mineral, and radium hid in tiny quantities beside barium. The Curies began the grim labour of differential crystallisation, separate by separate, until chemistry itself seemed a kind of patient siege. They started with a 100-gram sample in April 1898, but the scale of the task soon became clear. They would eventually need tonnes of ore. From a tonne of pitchblende they separated one-tenth of a gram of radium chloride in 1902, and in 1910 Marie isolated pure radium metal. She never succeeded in isolating polonium, whose half-life is only 138 days. Between 1898 and 1902, they published 32 papers and showed that radium destroyed diseased cells faster than healthy ones. CHAPTER: Professor at Paris By 1900 Marie had become the first woman faculty member at the École normale supérieure de jeunes filles, and Pierre joined the University of Paris. In 1902 she visited Poland when her father died, carrying both grief and the knowledge that her work was now changing medicine as well as physics. In June 1903 she earned her doctorate at the University of Paris under Gabriel Lippmann, while the couple had just been invited to the Royal Institution in London to give a Friday Evening Discourse on Radium. Marie was four months pregnant and exhausted, so Pierre delivered the lecture in French, yet he made her role unmistakable. Lady Dewar gave Marie a bouquet of La France Rosa, and she sat in the front row among the distinguished guests. CHAPTER: Stockholm and Fame That December, the Royal Swedish Academy of Sciences awarded Pierre Curie, Marie Curie, and Henri Becquerel the Nobel Prize in Physics for their joint researches on the radiation phenomena discovered by Professor Henri Becquerel. Marie became the first woman Nobel laureate. The committee had first intended to honour only Pierre and Becquerel, until Magnus Gösta Mittag-Leffler warned Pierre, and her name was added. The Curies did not go to Stockholm in 1903 because they were working and Pierre was unwell; they finally travelled in 1905 to deliver the required lecture. The prize money allowed them to hire a first laboratory assistant, but they still lacked a proper laboratory even after Pierre was made professor and chair of physics. CHAPTER: Widowhood in 1906 In December 1904 their second daughter, Ève, was born, and Marie ensured both girls were taught Polish by governesses and visits to Poland. Then on 19 April 1906 Pierre died in a road accident on the Rue Dauphine, struck by a horse-drawn vehicle in heavy rain and killed instantly when his skull was fractured under the wheels. Marie was devastated. Yet on 13 May the University of Paris offered her the chair created for him, and she accepted, hoping to build a world-class laboratory as a tribute to Pierre. She became the first woman professor at the University of Paris, stepping into the place where grief and authority met. CHAPTER: Radium Institute Her fight for a real laboratory went on. In 1909 Pierre Paul Émile Roux of the Pasteur Institute proposed that she move there, frustrated by the University of Paris's delays. Only then did the university yield, and the Radium Institute was created as a joint initiative of the Pasteur Institute and the University of Paris. Marie directed it and later headed the Curie Laboratory there. In 1910 she isolated radium and established the international standard for radioactive emissions, later named the curie. Yet the French Academy of Sciences denied her membership in 1911 by one or two votes, choosing Édouard Branly instead. The snub said much about French science and its gatekeepers. CHAPTER: Scandal and Chemistry That same year, the press turned vicious. Marie was attacked as a foreigner, an atheist, and, amid the affair with Paul Langevin, a married physicist and former student of Pierre's, as a scandalous outsider. She was in Belgium when the uproar broke; on returning, she found a mob outside her house and sought refuge with her daughters at the home of Camille Marbo. Yet the Royal Swedish Academy of Sciences honoured her again with the 1911 Nobel Prize in Chemistry, for the discovery of radium and polonium and the isolation of radium. Svante Arrhenius tried to stop her attending the ceremony on moral grounds. She replied that the prize had been given for her discovery, and that her private life had no relation to her scientific work. CHAPTER: War in the Hospitals A month after the Nobel ceremony, she was hospitalised with depression and a kidney ailment, and much of 1912 passed in retreat, including time in England with Hertha Ayrton. She returned to the laboratory in December. Then the First World War changed everything. Marie saw that wounded soldiers needed immediate surgery, and that field radiological centres near the front could save limbs and lives. After a rapid study of radiology, anatomy, and automotive mechanics, she procured X-ray equipment, vehicles, and generators, creating mobile radiography units called petites Curies. By late 1914 she had established France's first military radiology centre, with 20 mobile vehicles and 200 field units in the first year, and she trained women aides. CHAPTER: Radium for the Front In 1915 she made hollow needles containing radium emanation, later identified as radon, to sterilise infected tissue, using radium from her own one-gram supply. More than a million wounded soldiers were treated by her X-ray units. She worked not for applause but for necessity, and the French government gave her no formal recognition. She had tried to donate her Nobel gold medals to the war effort, but the French National Bank refused them. So she bought war bonds with the Nobel money and wrote plainly that the state needed it, even if the money might be lost. She also served on committees of Poles in France, keeping the Polish cause alive while France bled. CHAPTER: The American Tour After the war she put her experience into Radiology in War, published in 1919. In 1920, when the discovery of radium was 25 years old, the French government granted her a stipend once held by Louis Pasteur. The next year she travelled to the United States to raise funds for radium research, aided by Marie Mattingly Meloney, who interviewed her and created the Marie Curie Radium Fund. In 1921 President Warren G. Harding received her at the White House and presented the one gram of radium collected in America. France offered her the Legion of Honour, but she refused it. In 1922 she became a fellow of the French Academy of Medicine and lectured in Belgium, Brazil, Spain, and Czechoslovakia. CHAPTER: Poland and the Institute Marie never ceased to think in Polish as well as French. She taught her daughters Polish, visited her native country, and named polonium for it. In 1925 she returned to Warsaw for the laying of the foundations of the Radium Institute, and in 1929 her second American tour helped equip that institute with radium. It opened in 1932, with Bronisława as director. By then the Curie Institute in Paris, founded in 1920, had already become one of the great radioactivity laboratories in the world, producing four Nobel Prize winners, including Irène Joliot-Curie and Frédéric Joliot-Curie. Marie also served on the League of Nations' International Committee on Intellectual Cooperation from 1922 to 1934, working with Albert Einstein, Hendrik Lorentz, and Henri Bergson. CHAPTER: Final Year at Passy Her honours kept coming. In 1930 she was elected to the International Atomic Weights Committee, and in 1931 she received the Cameron Prize for Therapeutics of the University of Edinburgh. But her body was paying the price of years spent among radioactive substances and unshielded X-rays. She had carried test tubes in her pocket, kept them in a desk drawer, and watched their faint glow in the dark. She visited Poland one last time in early 1934. A few months later, on 4 July 1934, she died aged 66 at the Sancellemoz sanatorium in Passy, Haute-Savoie, of aplastic anaemia believed to have come from radiation exposure during her research and wartime radiology. CHAPTER: Panthéon and Curium She was buried at Sceaux beside Pierre, and in 1995 their remains were moved to the Paris Panthéon, sealed in lead because of radioactivity. Marie became the first woman honoured there on her own merits. Her papers from the 1890s are still dangerous to handle, and even her cookbooks are radioactive, kept in lead-lined boxes. In 1935 her daughter Ève published Madame Curie, and in 1935 a statue of Maria Skłodowska stood before the Radium Institute, where Kazimierz Żorawski, long ago rejected by family duty and class, would later sit and look on. The synthetic element curium bears her name, a final scientific echo of the woman who turned a shed in Paris into a new age of chemistry and physics.