The physicist Hans Christian Ørsted was born #OTD in 1777. In 1820 he demonstrated an unexpected connection between electric and magnetic phenomenon, believed by many to be unrelated, initiating the development of the theory of electromagnetism. Image: Danmarks Tekniske Museum

Louis Victor Pierre Raymond de Broglie, the 7e duc de Broglie, was born #OTD in 1892. He postulated that matter must have wave-like properties, one of the defining features of quantum mechanics. Image: APS

As luck would have it, I am in Vienna and was able to see Margaret Macdonald Mackintosh's "The Seven Princesses" at the MAK. It is *stunning*.

I mean.

Engineer and inventor Frances Hugle was born #OTD in 1927. She pioneered techniques used in microcircuitry fabrication and obtained patents for many of them, including methods for printing circuits and producing semiconducting films. Image: IEEE

Astronomer Milton La Salle Humason was born #OTD in 1891. He dropped out of the eighth grade and had little formal education, but a knack for difficult observations helped him collect much of the data used to establish what we now call Hubble’s Law. Image: Emilio Segrè Archives

Robert McNees Lovely piece. But I feel bound to mention that over three quarters of the red shifts used in the 1929 graph were from Slipher, so not acknowledging him was the greater sin in that particular paper

The Voyager 2 spacecraft launched #OTD in 1977. It is currently 12.4 billion miles from Earth, hurtling through interstellar space at about 34,400 mph with respect to the sun. Image: NASA/JPL-Caltech

Working on shutting it down since he bought it.

No, they have a longstanding policy against printing that kind of stuff unless it’s from a Democrat’s campaign.

obsessed with kevin durant going down the water slide with his hands raised in the air while everyone else chills in the water. this man continues to be the most relatable NBA player

Reporter: Madame President, what's your favorite Hüsker Dü album? Harris: What kind of question is -- [Walz grabs podium] Walz: FLIP YOUR WIG

Oh man I’m so surprised 🙄 restofworld.org/2024/twitter-x…

Conversations over at Bluesky are so much more pleasant and interesting than over here. But so few physicists have come over! Please consider joining, even if you just double-post everything. It’s hard to abandon followers, but sometimes infrastructure needs to be upgraded.

It’s our Sister’s birthday🥳

TIL about this repository of very useful formulae/conventions on Robert McNees's site jacobi.luc.edu/Useful.html