Claims

Johannes Kepler established that planets move in ellipses around the sun and derived phenomenological rules about planetary motion; Newton built on Kepler's observations to derive the inverse square law of gravity that explains Kepler's rules from first principles.

The difference between general relativity (primarily Einstein's accomplishment) and quantum mechanics (developed through contributions from dozens of physicists including Planck, Einstein, Rutherford, Bohr, de Broglie, Heisenberg, Schrödinger, Dirac, and others) demonstrates that the 'great man theory' is not characteristic of how physics is usually done; quantum mechanics involved many necessary pieces from many contributors.

Before Newton, Aristotle claimed that things have natural places they want to be and natural ways they want to move, but Newton replaced this with the principle that objects not acted upon by force continue in straight lines at constant velocity, and those acted upon by force follow equations of motion.

The inverse square law of gravity was not Newton's unique insight but was discussed by multiple contemporaries including Christian Huygens in the Netherlands and Robert Hooke; none of them had Newton's mathematical skill, and it took social pressure from Halley and others for Newton to write up his solution, resulting in the Principia Mathematica.

Four physicists—Clauser, Horn, Shimony, and Holt—formulated Bell's inequality (called the CHSH inequality) as a neat mathematical inequality that experimentalists could test to determine once and for all whether Einstein or Bohr was correct.

The 1927 Solvay Conference in Brussels is often regarded as the most intelligent picture ever taken and marked the point when the full quantum mechanics framework had evolved from old quantum theory, attributed to both Heisenberg and Schrödinger.

Einstein was unhappy with Boris Podolski leaking the EPR paper to the New York Times and publicizing it in this manner, not because he disagreed with the paper's content but because Einstein felt the work was not actually his own.

The original quantum theory seed began in 1900 when Max Planck suggested that radiation given off by warm bodies is not continuous but discrete—coming in lumps or separate drips rather than as a smooth stream.

Einstein extended Planck's idea by proposing that all electromagnetic radiation—light in all its wavelengths—can be understood as quantized particles called photons.

Niels Bohr extended quantum ideas to describe the energy of electrons as they arrange themselves around an atomic nucleus, proposing that electron energy comes in discrete levels rather than allowing electrons to have any energy they want.

Rutherford's discovery revealed that atoms consist mostly of empty space with a tiny dense nucleus in the middle and electrons around the outside, resembling a miniature solar system—a picture that was soon discovered to be incorrect.

In the summer of 1925, Werner Heisenberg, while recovering from hay fever on the treeless island of Helgoland in the North Sea, developed the mathematical framework that became quantum mechanics and fundamentally changed our view of the universe.

Both Werner Heisenberg and Erwin Schrödinger developed distinct mathematical approaches to quantum mechanics, but these approaches were soon discovered to be equivalent, and modern quantum mechanics teaching uses a mixture of both.

Marie Curie is the only woman in the 1927 Solvay Conference photograph and is the only person in the photograph who won two Nobel prizes, while none of the other physicists present achieved that distinction.

Einstein and Niels Bohr engaged in a famous debate at the 1927 Solvay Conference about the nature of reality, and simplified versions of history suggest that Bohr won the argument, establishing the Copenhagen interpretation.

Throughout the 20th century, quantum mechanics evolved from the old quantum theory of 1900 to fully-fledged quantum mechanics by the 1920s, then advanced to quantum field theory by the 1940s through work by Feynman, Schwinger, and Tomonaga on quantum electrodynamics.

Despite being a revolutionary scientist himself, Einstein remained reluctant to embrace all the predictions and implications of quantum mechanics, publishing the famous EPR paper in the mid-1930s with Boris Podolski and Nathan Rosen to outline his issues with quantum mechanics.

Erwin Schrödinger, another physicist who sided with Einstein, wrote a three-paper set of articles in Nature the same year as the EPR paper, in which he first described his famous cat in the box—the cat that is dead and alive at the same time until observed.

Einstein later wrote to physicist Max Born complaining about what quantum mechanics says is happening in the EPR paper, and in this letter he first uses the term 'spooky action at a distance' to describe how photon two and photon one could be instantaneously communicating despite being far apart.

John Bell was an Irish physicist who famously disliked the Copenhagen interpretation and was reluctant to confront Niels Bohr about it when they were caught in a lift together at some point, but later in the 1960s developed a groundbreaking theorem.

John Clauser first performed the Bell's inequality test at Berkeley in the early 1970s, followed by Alan Aspect and collaborators at Orsay, France in the early 1980s, and then many other experiments, particularly by Anton Zeilinger, an Austrian physicist.

In 2022, Clauser, Aspect, and Zeilinger won the Nobel Prize in Physics for tests of Bell's inequality, confirming that quantum mechanics is right and Einstein could not be right—quantum entanglement is real.

The speaker personally met John Bell at an American Physical Society meeting in Baltimore in 1989 while finishing his PhD, and had the courage that Bell lacked—to challenge someone promoting a quantum mechanics idea the speaker thought was nonsense.

Decoherence as a concept was developed mainly by Dieter Zurek up to about a half-century ago, and it is now a very well-developed idea in physics that solves puzzles like Schrödinger's cat paradox.

When methodological advances (whether conceptual like quantum field theory or instrumental like X-rays) are made in science, there is typically a short period (5-10 years) of intense 'low-hanging fruit' discovery, followed by a long 'cruise period' of 50-100 years of incremental progress before another major breakout occurs.