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Robert McNees Profile picture
@mcnees
Sep 27, 2018 • 3 tweets • 2 min read • Read on X
It’s the formula we all know: E = mc².

Einstein submits his second special relativity manuscript, in which he proposes mass-energy equivalence, to Annalen der Physik #OTD in 1905. His first SR paper had appeared the previous day.

An English translation: fourmilab.ch/etexts/einstei…
Einstein wasn’t the first to propose a relationship between changes in an object’s energy and its inertia. But afaik he was the first to propose that the relationship goes beyond energy lost to radiation, as well as get the correct form of the equivalence.
cc @Noahpinion

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More from @mcnees

Robert McNees Profile picture
Oct 8, 2018
Good afternoon.
Happy Dogtober.
Botticelli’s “The Birth of Venus” but it’s a poodle.
Read 4 tweets
Robert McNees Profile picture
Oct 7, 2018
The physicist Niels Bohr was born #OTD in 1885. He applied Planck’s new ideas about quanta to develop the first modern model of atomic structure in 1913, which motivated the development of quantum mechanics over the next few decades.
Inage: Atomic Heritage Foundation
Here’s a thread from last year about the historical context for his model, and how it set physicists on the path to quantum mechanics.
A story about Bohr. In 1939, Rosenfeld told the Princeton Physics Journal Club about his work with Bohr on fission, after Meitner & Frisch's discovery but before its publication. Bohr quickly wrote a letter to Nature asserting priority of Meitner & Frisch. nature.com/articles/14333…
Read 4 tweets
Robert McNees Profile picture
Oct 5, 2018
Jason Van Dyke found guilty of 2nd degree murder and multiple counts of aggravated battery with a firearm.
All 16 counts of aggravated battery. One for each shot.
Not guilty of Official Misconduct, apparently?
Read 4 tweets
Robert McNees Profile picture
Oct 4, 2018
Koba & Takeda submitted their paper "Radiation Reaction in Collision Processes, III" to the journal Progress of Theoretical Physics #OTD in 1948. It described a method for calculating certain quantities in quantum electrodynamics via "transition diagrams." academic.oup.com/ptp/article/4/…
Their paper was submitted just two days before Freeman Dyson's ground-breaking article on Feynman diagrams was submitted to Physical Review. The approaches are very similar, as was clear to all three scientists!
Upon learning of their results, Dyson amended his own paper to recognize their work. He lamented the effect of the war on the dissemination of important ideas: "The isolation of these Japanese workers has undoubtedly constituted a serious loss to theoretical physics."
Read 4 tweets
Robert McNees Profile picture
Oct 4, 2018
He took out a full page ad in the newspaper demanding the death penalty for five black kids who turned out to be innocent, and still insisted on their guilt even after the real perpetrator confessed.
Here is the ad Trump placed in all four of New York’s major newspapers, months before the end of the trial, when I’d assume presumption of innocence would still apply.
Then in 2014 he *wrote an op-ed* in the Daily News saying they were probably still guilty, even though someone else confessed to the crime.
nydailynews.com/new-york/nyc-c…
Read 4 tweets
Robert McNees Profile picture
Oct 4, 2018
Sputnik 1, the first satellite made by humans, was launched into low Earth orbit #OTD in 1957.
Image: NSSDC, NASA
The launch of Sputnik marked the beginning of the Space Age. Here, let a young Jeff Goldblum show you what the mood was like in the Pentagon.
Before young squire Goldblum was warning us about the perils of toying with dinosaur DNA (@SUEtheTrex), he was racing down the hallways of the Pentagon with the latest bit of intel on the threat from above.
Read 4 tweets

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