1831 – James Clerk Maxwell, Scottish physicist and mathematician is born.
James Clerk Maxwell was a Scottish scientist in the field of mathematical physics. His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as manifestations of the same phenomenon. Maxwell’s equations for electromagnetism have been called the “second great unification in physics” after the first one realised by Isaac Newton.
With the publication of “A Dynamical Theory of the Electromagnetic Field” in 1865, Maxwell demonstrated that electric and magnetic fields travel through space as waves moving at the speed of light. Maxwell proposed that light is an undulation in the same medium that is the cause of electric and magnetic phenomena. The unification of light and electrical phenomena led to the prediction of the existence of radio waves.
Maxwell helped develop the Maxwell–Boltzmann distribution, a statistical means of describing aspects of the kinetic theory of gases. He is also known for presenting the first durable colour photograph in 1861 and for his foundational work on analysing the rigidity of rod-and-joint frameworks (trusses) like those in many bridges.
His discoveries helped usher in the era of modern physics, laying the foundation for such fields as special relativity and quantum mechanics. Many physicists regard Maxwell as the 19th-century scientist having the greatest influence on 20th-century physics. His contributions to the science are considered by many to be of the same magnitude as those of Isaac Newton and Albert Einstein. In the millennium poll—a survey of the 100 most prominent physicists—Maxwell was voted the third greatest physicist of all time, behind only Newton and Einstein. On the centenary of Maxwell’s birthday, Einstein described Maxwell’s work as the “most profound and the most fruitful that physics has experienced since the time of Newton”.
1911 – Luis Walter Alvarez, American physicist and academic, Nobel Prize laureate, is born.
Luis Walter Alvarez was an American experimental physicist, inventor, and professor who was awarded the Nobel Prize in Physics in 1968. The American Journal of Physics commented, “Luis Alvarez was one of the most brilliant and productive experimental physicists of the twentieth century.”
After receiving his PhD from the University of Chicago in 1936, Alvarez went to work for Ernest Lawrence at the Radiation Laboratory at the University of California in Berkeley. Alvarez devised a set of experiments to observe K-electron capture in radioactive nuclei, predicted by the beta decay theory but never observed. He produced tritium using the cyclotron and measured its lifetime. In collaboration with Felix Bloch, he measured the magnetic moment of the neutron.
1949 – Ann Druyan, American popular science writer is born.
Ann Druyan is an Emmy Award-winning American writer and Peabody Award-winning producer specializing in the communication of science. She co-wrote the 1980 PBS documentary series Cosmos, hosted by Carl Sagan, whom she married in 1981. She is the creator, producer, and writer of the 2014 sequel, Cosmos: A Spacetime Odyssey.
She was the Creative Director of NASA’s Voyager Interstellar Message Project, the golden discs affixed to both the Voyager 1 and Voyager 2 spacecraft.
1983 – Pioneer 10 becomes the first man-made object to leave the central Solar System when it passes beyond the orbit of Neptune.
Pioneer 10 crossed the orbit of Saturn in 1976 and the orbit of Uranus in 1979. On June 13, 1983, the craft crossed the orbit of Neptune, the outermost planet, and so became the first human-made object to leave the proximity of the major planets of the Solar System. The mission came to an official end on March 31, 1997, when it had reached a distance of 67 AU from the Sun, though the spacecraft was still able to transmit coherent data after this date.
1986 – Lea Verou, Greek computer scientist and author is born.
Lea Verou is a front end web developer, speaker and author, originally from Greece. Verou is currently a Research Assistant at MIT CSAIL, in David Karger’s Haystack group and an Invited Expert in the W3C CSS Working Group.
Verou has written a book on advanced CSS for O’Reilly, worked for W3C/MIT, gave over 60 invited talks around the world, released several open source projects, co-founded a Greek startup called Fresset Ltd (which she left in 2011), among other projects. She has written articles for some of the biggest industry media, including A List Apart and Smashing Magazine.
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