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Roger Freedman

@rogerfreedman

Physics educator at UC Santa Barbara, textbook author, and San Diego Comic-Con OG. he/him/his

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Latest posts by Roger Freedman @rogerfreedman

Émilie du Châtelet (Stanford Encyclopedia of Philosophy)

I’m not sure, but there’s an extensive bibliography here: plato.stanford.edu/entries/emil...

10.03.2026 14:29 👍 1 🔁 0 💬 1 📌 0
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The worst cabinet in American history And it's not even close.

“He has no national security experience, no law enforcement experience, and no experience in immigration or any of the other issues the department deals with.

On the other hand, he did run his family’s plumbing business.”

Another edition to the collection!

www.publicnotice.co/p/trump-cabi...

10.03.2026 12:33 👍 1039 🔁 241 💬 32 📌 8
Out of 10 men , one makes a sexual joke at a woman, two laugh, three fake a chuckle to fit in, and four stay silent.  None of them speak up. Later, none of them still believe they're the "good guys." But from the woman's perspective , the laughter, the silence , the looking away, it all creates the same environment. So when women say "most men are the same," this is what they mean: not that every man harassed women, but that most men helpmprotect the system that does.

Out of 10 men , one makes a sexual joke at a woman, two laugh, three fake a chuckle to fit in, and four stay silent. None of them speak up. Later, none of them still believe they're the "good guys." But from the woman's perspective , the laughter, the silence , the looking away, it all creates the same environment. So when women say "most men are the same," this is what they mean: not that every man harassed women, but that most men helpmprotect the system that does.

Posted by a friend on Instagram.

Yea, I see the resemblance to the other nine men. Taking it in seriously.

During #WomensHistoryMonth, I can personally reflect on this, and feel amazed at how women have made history despite this built in disadvantage.

Backwards, in heels, and harassed.

09.03.2026 14:44 👍 530 🔁 207 💬 19 📌 18
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In contrast to the coverup of the EPSTEIN crimes here in America, there are ongoing investigations in the UK, France, Turkey, Poland, Latvia & Lithuania that is sure to expose his central, filthy role in the largest crimes against humanity case in world history. #AccountabilityIsComing

09.03.2026 20:30 👍 33864 🔁 9342 💬 1765 📌 664
Portrait of Émile du Châtelet by Marianne Loir

Portrait of Émile du Châtelet by Marianne Loir

At age 42, with her career at full steam, du Châtelet gave birth to the child of poet Jean François de Saint-Lambert. She died of a pulmonary embolism just six days later. Today she is commemorated by the annual Émilie du Châtelet Prize given by the Société Française de Physique. #WomenInSTEM 🧵7/7

10.03.2026 00:57 👍 2 🔁 1 💬 0 📌 0
Émilie de Châtelet’s translation of Isaac Newton’s Principia Mathematica

Émilie de Châtelet’s translation of Isaac Newton’s Principia Mathematica

Émilie du Châtelet was the first to translate Newton’s Principia Mathematica into French, but did even more: She added important commentary about planetary orbits and included her derivation of the conservation of energy from the principles of mechanics, which Newton had not done. #WomenInSTEM 🧵6/7

10.03.2026 00:57 👍 2 🔁 1 💬 2 📌 0
“Institutions de Physique” by Émilie de Châtelet

“Institutions de Physique” by Émilie de Châtelet

Her 1740 book “Institutions de Physique” (“Lessons in Physics”) synthesized contemporary ideas in physics. In the book she emphasized the very Einsteinian idea that absolute position is an idealization and that only relative position is a measurable quantity. #WomenInSTEM 🧵5/7

10.03.2026 00:55 👍 0 🔁 0 💬 1 📌 0
Dissertation On the Nature and Propagation of Fire by Émilie du Châtelet (1744)

Dissertation On the Nature and Propagation of Fire by Émilie du Châtelet (1744)

In 1737 the Royal Academy of Science in Paris held an essay competition on the nature and competition of fire. Du Châtelet’s essay became the Academy’s first publication by a woman. She argued that fire is a massless particle—perhaps presaging the 20th-century idea of a photon. #WomenInSTEM 🧵4/7

10.03.2026 00:54 👍 0 🔁 0 💬 1 📌 0
Frontispiece of Éléments de la philosophie de Newton, 1738

Frontispiece of Éléments de la philosophie de Newton, 1738

In 1733 she also began a long relationship with the poet Voltaire. She tutored him in physics, and co-authored the 1738 book “Elements of the Philosophy of Newton.” In the frontispiece of the book du Châtelet is depicted as reflecting Newton's heavenly insights down to Voltaire. #WomenInSTEM 🧵3/7

10.03.2026 00:53 👍 0 🔁 0 💬 1 📌 0
Arms of the house of Châtelet

Arms of the house of Châtelet

Born to a member of the court of Louis XIV, Émilie was married at age 18 to the Marquis Florent-Claude du Chastellet-Lomont, with whom she had three children. In 1733, at age 26, she considered her marital responsibilities fulfilled and began to study mathematics in earnest. #WomenInSTEM 🧵2/7

10.03.2026 00:52 👍 0 🔁 0 💬 1 📌 0
Portrait of Émile du Châtelet by Maurice Quentin de la Tour

Portrait of Émile du Châtelet by Maurice Quentin de la Tour

For #WomensHistoryMonth: Let us celebrate the life and accomplishments of French mathematician and physicist Émilie du Châtelet (1706-1749). She spread the then-new ideas of Isaac Newton on the Continent, and played a key role in developing the idea of energy conservation. 🎢⚛️🧪 #WomenInSTEM 🧵1/7

10.03.2026 00:51 👍 20 🔁 11 💬 1 📌 0
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CNN airs compilation of JD Vance on the campaign trail saying he would keep the U.S. out of war in the Middle East. "We're going to stop sending our young people to far away lands. We are not the policemen of the world. Our interests are very much in not going to war with Iran."

09.03.2026 21:17 👍 1442 🔁 541 💬 38 📌 33

Six years ago this week, an unplanned disaster engulfed the world. Trump catastrophically mismanaged it. The economy collapsed and 1m+ died.

Now reelected, he’s on the verge of topping that, only this time the disaster is entirely of his own making.

The results may be even worse.

09.03.2026 06:02 👍 799 🔁 256 💬 23 📌 12
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05.03.2026 21:43 👍 1219 🔁 583 💬 57 📌 26

One of the finest physics colloquia I’ve ever seen was the one presented at Stanford by Don Herbert, aka Mr. Wizard, back in the 1970s. 🎢

09.03.2026 03:31 👍 3 🔁 0 💬 0 📌 0
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AOC: The Pentagon has not passed an audit, and they are out here trying to kick people with disabilities off of Medicaid. It is corruption that is stealing from the public coffers — and that is the actual waste, fraud, and abuse.

09.03.2026 00:20 👍 19920 🔁 6152 💬 262 📌 176

I'm very proud of having worked in this wonderful project!

09.03.2026 01:59 👍 5 🔁 1 💬 0 📌 0

By the great @laloalcaraz.bsky.social!

09.03.2026 01:18 👍 0 🔁 0 💬 0 📌 0

Historian here no literary scholar but here we are

09.03.2026 00:03 👍 276 🔁 60 💬 10 📌 1

And yet, not a word indicating agency in the title or subhead. It’s not “upon us”, it is a direct and obvious consequence of choices by US leadership

09.03.2026 00:03 👍 156 🔁 42 💬 3 📌 0
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Moco-Comics | Monitos de Juanele Toda mi vida me ha gustado hacer comics. Intento que cada librito que hago sea único, con identidad propia y mejor que el anterior, tratando de mejorar cada vez. Se ven bonitos todos juntos, ¡Cómprenm...

PS: If you'd like to see more #comics by Juanele, visit his website!

09.03.2026 00:51 👍 5 🔁 0 💬 0 📌 0
Cover of Dr. Ana María Porras's SciWomen Origin Story

Cover of Dr. Ana María Porras's SciWomen Origin Story

And here's the origin story of microbiologist Dr. Ana María Porras, who creates crocheted models of microbes for science communication! She participates in efforts to make STEM accessible to Spanish-speaking students.

Link: sciall.org/wp-content/u...

🧪 #biology #WomenInSTEM 🧵7/7

09.03.2026 00:46 👍 8 🔁 2 💬 1 📌 0
Cover of Dr. Earyn McGee's SciWomen Origin Story

Cover of Dr. Earyn McGee's SciWomen Origin Story

Here's the origin story of herpetologist Dr. Earyn McGee, Coordinator of Conservation at the Los Angeles Zoo. Her #FindThatLizard social media campaign educates and inspires a global audience about herpetology.

Link: sciall.org/wp-content/u...

🧪 #herpetology #WomenInSTEM 🧵6/7

09.03.2026 00:42 👍 9 🔁 3 💬 1 📌 0
Cover of Dr. Ritu Raman's SciWomen Origin Story

Cover of Dr. Ritu Raman's SciWomen Origin Story

Here's the origin story of mechanical engineer Dr. Ritu Raman, who designs adaptive biological materials and is passionate about equity and inclusion initiatives, especially those that inspire women to pursue STEM.

Link: sciall.org/wp-content/u...

🧪 #Engineering #WomenInSTEM 🧵5/7

09.03.2026 00:38 👍 5 🔁 1 💬 1 📌 0
Cover of Dr. Kristin Lear's SciWomen Origin Story

Cover of Dr. Kristin Lear's SciWomen Origin Story

Here's the origin story of conservation biologist Dr. Kristin Lear, who directs the Agave Restoration Program at Bat Conservation International (www.batcon.org) with the goal of restoring a critical food resource for bats.

Link: sciall.org/wp-content/u...

🧪 #Biology #WomenInSTEM 🧵4/7

09.03.2026 00:34 👍 5 🔁 1 💬 1 📌 0
Cover of Dr. Burçin Mutlu-Pakdil's SciWomen Origin Story

Cover of Dr. Burçin Mutlu-Pakdil's SciWomen Origin Story

Here's the origin story of astronomer Dr. Burçin Mutlu-Pakdil, who has persevered through religious bans, moving to a new country, and countless other hurdles to become a professor and mentor to the underrepresented.

Link: sciall.org/wp-content/u...

🧪🎢⚛️🔭⭐ #WomenInSTEM 🧵3/7

09.03.2026 00:29 👍 29 🔁 7 💬 1 📌 1
Cover of Dr. Jessica Esquivel's SciWomen Origin Story

Cover of Dr. Jessica Esquivel's SciWomen Origin Story

Here's the origin story of experimental particle physicist Dr. Jessica Esquivel—proudly queer, Black, Latina, and neurodivergent, and a vocal advocate for diversity and inclusion in STEM.

Link: sciall.org/wp-content/u...

🧪🎢⚛️ #WomenInSTEM 🧵2/7

09.03.2026 00:22 👍 37 🔁 14 💬 1 📌 1
(L-R) Top: Kristen Lear, Burçin Mutlu-Pakdil and Ritu Raman. Bottom: Jessica Esquivel, Ana Maria Porras, and Earyn McGee.

(L-R) Top: Kristen Lear, Burçin Mutlu-Pakdil and Ritu Raman. Bottom: Jessica Esquivel, Ana Maria Porras, and Earyn McGee.

For #WomensHistoryMonth and #InternationalWomensDay, let us celebrate six outstanding women in science through their origin stories — as told in comic book form by the talented artist Juanele (@juaneletamal.bsky.social). Follow along to links to their stories!🧪🎢⚛️🪐🔭 #WomenInSTEM 🧵1/7

09.03.2026 00:17 👍 18 🔁 15 💬 1 📌 1
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08.03.2026 12:49 👍 20739 🔁 7239 💬 1188 📌 473
Plaque at the Rahlgasse 4 girls' grammar school, from which Marietta Blau graduated in 1914. English translation:

Marietta Blau (1894-1970) graduated from this school in 1914. As a nuclear physicist she was a pioneer in the development of the photographic method of particle detection. This method made possible the discovery of "nuclear disintegration stars." Blau was forced to leave Austria in 1938.

Plaque at the Rahlgasse 4 girls' grammar school, from which Marietta Blau graduated in 1914. English translation: Marietta Blau (1894-1970) graduated from this school in 1914. As a nuclear physicist she was a pioneer in the development of the photographic method of particle detection. This method made possible the discovery of "nuclear disintegration stars." Blau was forced to leave Austria in 1938.

Today she is commemorated by the Marietta Blau-Stipendium scholarship offered by the Austrian government. And in 2025 Austria's largest hub for particle physics research was inaugurated—the Marietta Blau Institute for Particle Physics (www.oeaw.ac.at/en/mbi/). #WomenInSTEM 🎢⚛️🧪 🧵7/7

08.03.2026 02:22 👍 12 🔁 1 💬 0 📌 0