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140 years ago today, James Clerk Maxwell died, aged 48

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'The work of James Clerk Maxwell changed the world forever.'
(Albert Einstein)

Maxwell's Equations (mathematically defining Electro-Magnetism) are, along with Newton's Laws of Motion and Einstein's Theory of General Relativity, one of the three greatest works in the history of modern physics. Quantum Electrodynamics could be the fourth but is not summarized as succinctly, nor so much the creation of one individual.
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Good Timing with yours, Eulalia.
It is now November 6 in London where this event occurred 100 years ago today. From Smithsonian.com

On November 6, scientists at a joint meeting of the Royal Society of London and the Royal Astronomical Society announced that measurements taken during a total solar eclipse earlier that year supported Einstein’s bold new theory of gravity, known as general relativity. Newspapers enthusiastically picked up the story. “Revolution in Science,” blared the Times of London; “Newtonian Ideas Overthrown.” A few days later, the New York Times weighed in with a six-tiered headline—rare indeed for a science story. “Lights All Askew in the Heavens,” trumpeted the main headline. A bit further down: “Einstein’s Theory Triumphs” and “Stars Not Where They Seemed, or Were Calculated to Be, But Nobody Need Worry.”

Einstein in 1919
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It should be noted that the British Astronomer, Sir Arthur Eddington, one of the few men in Britain at that time who understood Einstein's theory, had realized its import and help organize the expedition to confirm or disprove the prediction. Eddington was English of Quaker stock (and seemingly no Scottish - sorry Eul) and was awarded a scholarship to Trinity College, Cambridge in 1902. In 1904 Eddington became the first ever second-year student to be placed as Senior Wrangler. Look it up, those who don't know about the greats in Mathematics.
 
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Maxwell's Equations (mathematically defining Electro-Magnetism) are, along with Newton's Laws of Motion and Einstein's Theory of General Relativity, one of the three greatest works in the history of modern physics. Quantum Electrodynamics could be the fourth but is not summarized as succinctly, nor so much the creation of one individual.
Well, the demon helped too.
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Maxwell's Equations (mathematically defining Electro-Magnetism) are, along with Newton's Laws of Motion and Einstein's Theory of General Relativity, one of the three greatest works in the history of modern physics. Quantum Electrodynamics could be the fourth but is not summarized as succinctly, nor so much the creation of one individual.
"The Strangest Man" Paul Dirac (so called by Neils Bohr) picked up Maxwell and Einstein and ran with it.
He once said that he thought physicists wished they could be done with quantum electrodynamics.
Maxwell's equations (really distilled by Oliver Heaviside from 20 or so that Maxwell created) were an inspiration for relativity, because they contain the speed of light in a vacuum (the "c"). Einstein never liked the idea that one should see different physics just because one was moving with respect to someone else. So, the speed of light had to be constant, and that got the ball rolling. Things keep getting deeper and weirder, and there is no end in sight. Maxwell would, I think, be pleased.
 
Monday, November 11th will bring the last Transit of Mercury (passing of Mercury in line with the Sun as seen from Earth) until 2032. While few will see it (you need a telescope and knowledge of what you are doing, otherwise you may well end up blind!) to those who know the history of Astronomy, it is an event fraught with significance.
Prior to the 17th Century, Astronomers knew the relative sizes of the solar system and planet orbits, but had poor information on the absolute size. The challenge was to accurately measure the distance from the earth to the Sun.
Using parallax (the apparent shifting of an object against the background when you, the observer, move from side to side - the same tool your brain uses to judge distance with the slightly different angle from your separated eyes), they could have calculated the Sun's distance by comparing measurements taken a long distance apart at exactly the same time. The problem was that timekeeping was far too inaccurate to synchronize the observers' time.
So, Newton, in 1667 formulated his Theory of Universal Gravitation, explaining the motion of the planets without knowing the absolute size. Fortunately his equations were independent of size.
However, in 1677 Edmund Hally and Richard Towneley both observed Mercury's transit, and made a reasonable measure of Earth's distance from the Sun. Refined over the years to greater and greater accuracy, it was this measurement, using the Transit, which freed Astronomy to begin charting the size of the Universe.
For, even then we had parallax measurements for the nearest stars using six-month changes as the earth moved around the sun. All we were missing was the distance from one end of our orbit to the other. With the baseline measured, we began mapping interstellar distances (and learning how immense they were). The first unit for these was the parsec, the distance away an object was to cause a parallax of one second of arc (and not a measure of time as incorrectly used in the first Star Wars movie).
With that starting point we now measure distances in light-years and even billions of light-years.
All due to observing the Transit of Mercury.
 
Also,
This week marks the 500th anniversary of the first meeting of Cortés and the Aztec emperor Montezuma II at the entrance to Tenochtitlan (present-day Mexico City). Less than two years after that historic meeting, Montezuma II would be dead, Tenochtitlan would lie in ruins, and Cortés would accept the surrender of the defeated Aztecs, whose empire was gone forever.
 
07.11.1867, Warsow - Birthday of Marie Skłodowska Curie. She observed the radiation of uranium compounds and coined the word "radioactiv". She is one of only four persons (and the only female) who ever got more than one nobel prize and beside Linus Pauling the only one who got it in two different fields (physics and chemistry).
She was the first woman and the first female professor at the Sorbonne. During WW1 she developed a X-ray-car for examination near the front.
 
Also,
This week marks the 500th anniversary of the first meeting of Cortés and the Aztec emperor Montezuma II at the entrance to Tenochtitlan (present-day Mexico City). Less than two years after that historic meeting, Montezuma II would be dead, Tenochtitlan would lie in ruins, and Cortés would accept the surrender of the defeated Aztecs, whose empire was gone forever.
Are you sure that Barb´s story 1492 won´t change history as it is known until now?
 
07.11.1867, Warsow - Birthday of Marie Skłodowska Curie. She observed the radiation of uranium compounds and coined the word "radioactiv". She is one of only four persons (and the only female) who ever got more than one nobel prize and beside Linus Pauling the only one who got it in two different fields (physics and chemistry).
She was the first woman and the first female professor at the Sorbonne. During WW1 she developed a X-ray-car for examination near the front.
yes yes polish sister also now all kittys with broken paws can check broken or not in doctor who use x-ray also me heard becuse of to many researches about radioctive Marie not have long life ? :oops: :cat:
 
Are you sure that Barb´s story 1492 won´t change history as it is known until now?
It has been long apparent that @Barbaria1 (or at least her incredible body) can change history.

Bay of Pigs
Kennedy Assassination
Samson
Stan Goldman
Joseph Goebbels
Gustavus Adolphus
General MacArthur
Emperors Diocletian and Barbarossa
President Clinton
Erik Thorvaldsson, known as Erik the Red, father of Leif Erikson (by what woman?)
Columbus
who knows all the names?
One wonders at the real Caesar-Cleopatra-Antony story if Barbara had been there
Not to mention that little fracas over in Troy!
 
07.11.1867, Warsow - Birthday of Marie Skłodowska Curie. She observed the radiation of uranium compounds and coined the word "radioactiv". She is one of only four persons (and the only female) who ever got more than one nobel prize and beside Linus Pauling the only one who got it in two different fields (physics and chemistry).
She was the first woman and the first female professor at the Sorbonne. During WW1 she developed a X-ray-car for examination near the front.
Marie Curie's research was about isolating Radium from Uranium ore. When this became possible on an Industrial scale, Uranium was a waste product, without any use, until….

Incidentally, November 7th is also the birthday of another great woman in nuclear science : Lise Meitner (1878 - 1968).
Meitner had a more difficult carrier than Curie, and is considered one of those great scientists who deserved a Nobel Prize, but never got one. She studied physics in Vienna, after a law that forbade the access of woman to universities had been abandoned in 1897.

As a woman, she had difficulties to find an academic position, and she earned livings by teaching French. She moved to Berlin, at the Kaiser Wilhelm Institute, where she would work together with Otto Hahn.

Another coincidence with Marie Curie : during the war, she interrupted her academic work, to do become an X-ray technician in the medical service of the Austrian army.

Her work with Hahn would result into the discovery of nuclear fission, with experiments on... Uranium. The possible impact of this discovery became clear, and Uranium quickly shifted from an Industrial waste material, to one of the most desired metals in the world. The world's largests stock of Uranium was piled up in the world's only Uranium factory, in Belgium, other stocks were in Belgian Congo. Following the discovery of nuclear fission, they were shipped to the US, for in case..., to keep them out of Hitler's hands. Its value had become so high, that it completely compensated for Belgium's financial war debts.

Meitner's life in Berlin became difficult after Hitler came to power, since she was of Jewish descent. Although she initially enjoyed some protection, she fled Germany in 1938 and went to live in Sweden. She kept contact with Hahn, however.

Meitner was a pacifist and refused to join the Manhattan project, although in the USA she was after the war framed as the '(Jewish) mother of the atomic bomb', the woman who snatched the secret of the bomb from Hitler. But it was only Hahn who got the Nobel Prize in 1945, for the discovery of nuclear fission.
 
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