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Marie Skłodowska-Curie dies of radiation poisoning

Curie died at the Sancellemoz Sanatorium in Passy, Haute-Savoie, from aplastic anemia believed to have been contracted from her long-term exposure to radiation. The damaging effects of ionizing radiation were not known at the time of her work, which had been carried out without the safety measures later developed.

American mathematician John Allen Paulos is born

He is known as an author of books encouraging people to make sense of the statistics and figures that influence their lives. He writes about mathematics as a subject which is easy to learn and understand. His most famous book is Innumeracy: Mathematical Illiteracy and its Consequences from 1988. His academic work is mainly in mathematical logic and probability theory.

Mars Pathfinder lands

The probe consisted of a lander and a robotic rover named Sojourner. It was the first rover outside of the Earth–Moon system. Although planned to last only for one week, Sojourner was active for 83 Martian days. The mission analyzed Martian atmosphere, climate, geology and the composition of its rocks and soil.

Physicists at LHC announce the discovery of Higgs boson

The existence of the boson was first suggested in 1960s. It is the force carrier in so called Higgs field, a fundamental field of crucial importance to particle physics theory. The question of the existence of the Higgs field and Higgs boson was the last unverified part of the Standard Model of particle physics.

American astronomer Henrietta Swan Leavitt is born

She discovered the relationship between the luminosity and the period of Cepheid variable stars. She studied variable stars in the Magellanic Clouds. Her work allowed astronomers to measure the distance between the Solar system and faraway galaxies. Edwin Hubble later used it to prove that the universe is expanding.

Anniversaries of famous