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#OTD

11,390
posts · 30d
602
users
380
posts / day
18.9
posts / user
-11% vs last week

#OTD is an active hashtag on Bluesky. In the last 30 days, 602 people shared 11,390 posts with it — around 380 a day. Activity is down 11% versus the previous week, peaking on Oct 30 with 459 posts.

#OTD posts per day (last 30 days)

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#History 1,717 #OnThisDay 1,002 #TDIH 814 #MusicSky 760 #Arsenal 602 #Cuba 581 #health 579 #Salud 576 #medicina 576 #medicine 576 #WW2 387 #HBD 382

Posts with #OTD

Admirable Women
@admirablewomen.bsky.social
1 day ago
Lise Meitner co-discovered nuclear fission, explaining how an atomic nucleus splits. Otto Hahn won the 1944 Nobel Prize in Chemistry for the discovery of nuclear fission. Meitner was entirely excluded. #MatildaEffect Element 109, Meitnerium, is named in her honor. Born #OTD in 1878. #WomenInSTEM
Black-and-white photograph of Lise Meitner (1878–1968), the pioneering Austrian-Swedish physicist who co-discovered nuclear fission but was famously denied a Nobel Prize due to institutional bias. Seated in a dark wooden armchair, Meitner is positioned from the waist up, turned slightly to the right while gazing forward with a faint, contemplative smile and an intelligent, gentle expression. She wears a tailored, dark blazer over a crisp white blouse featuring a prominent, neatly tied white bow at the neck. Her dark hair is swept back neatly behind her ears. In her lap, she holds a small closed book. The background features a large, dark wooden bookshelf packed with rows of books, emphasizing an academic setting. The studio lighting casts soft highlights on her face and blouse, creating a stark, high-contrast composition that evokes an intellectual, dignified, and historic mood.
13 413 968
Admirable Women
@admirablewomen.bsky.social
1 day ago
Physicist & chemist Marie Curie was the: + First woman to win a Nobel Prize + First person & only woman to win twice + Only person to ever win a Nobel Prize in 2 different sciences: Physics (1903) & Chemistry (1911) Maria Skłodowska Curie was born #OTD in 1867. #WomenInSTEM
A striking black-and-white studio portrait of Marie Curie (1867–1934), the legendary Polish-French physicist and chemist who revolutionized modern science by discovering radioactivity, polonium, and radium. As the only person to win Nobel Prizes in two different scientific fields, her profound historical significance is reflected in her serious, deeply introspective expression. Photographed from the chest up, she looks directly at the camera with an intense, analytical gaze. Her graying hair is styled in a soft updo, framing a face etched with a look of quiet resolve and intellectual focus. She wears a dark, textured jacket over a shirt adorned with a distinctive geometric, black-and-white checkered pattern at the neckline. The portrait utilizes a stark, dark, textured background that blends into her clothing, creating a high-contrast composition that draws complete focus to her face. The overall mood is solemn, dignified, and powerful, capturing the essence of a brilliant academic pioneer who dedicated her life to scientific discovery.
29 368 1112
Admirable Women
@admirablewomen.bsky.social
1 day ago
#OTD in 1962, the indomitable Eleanor Roosevelt died. + First Chair of the Presidential Commission on the Status of Women + First US Representative to the UN Commission on Human Rights + First Chair of the UN Commission on #HumanRights #RoleModel #inspirational
Black-and-white photograph of Eleanor Roosevelt (1884–1962), a pioneering First Lady, diplomat, and human rights activist who famously chaired the UN Commission on Human Rights and helped draft the Universal Declaration of Human Rights. She is positioned against a soft, subtly textured, light-colored studio backdrop that creates a gentle vignette around her. Angled slightly to the right while turning her face toward the camera, she displays a warm, gentle smile, conveying an approachable, dignified, and sincere mood. Her dark, wavy hair is styled in a classic 1930s bob, neatly parted and framing her face. She wears a dark, elegantly draped V-neck dress or blouse, accessorized with a single, long strand of polished pearls that loops around her neck and extends past the bottom frame. The lighting softly illuminates the left side of her face, highlighting her eyes and serene expression, emphasizing her historical significance as a compassionate leader.
26 293 957
Admirable Women
@admirablewomen.bsky.social
about 15 hours ago
Anna Bissell was the first woman CEO in the US. She took over the Bissell company in 1889. She secured patents, boosted marketing, and grew exports to Europe & Latin America. By ~1899, she had created the largest organization of its kind in the world. She died #OTD in 1934. #WomenInBusiness
Formal black-and-white portrait of Anna Sutherland Bissell (1846–1934), recognized as America’s first female CEO who built the world's largest carpet sweeper company and pioneered progressive employee benefits. Seated or standing against a dark, textured, and undecorated studio backdrop, Bissell is captured in a three-quarter bust view, turned slightly to the right while her calm gaze meets the camera. Her facial expression is serene and dignified, with a subtle, composed hint of a smile. Her thick, white hair is styled elegantly, swept up and away from her face in a neatly sculpted pompadour or Gibson Girl roll. She wears an elaborate dark lace gown accented with a small decorative brooch or buckle pinned at the center chest over a patch of lighter lace fabric. Draped heavily over her shoulders is a plush, luxurious dark fur stole or coat collar. The soft studio lighting illuminates her face, highlighting her features and creating an elegant, authoritative, and historic mood.
8 236 721
Admirable Women
@admirablewomen.bsky.social
about 5 hours ago
Dr. Darleane Hoffman was a giant of nuclear chemistry. She was the first female technical division leader at Los Alamos National Laboratory. Her work mapped the properties of the heaviest transuranium elements on the periodic table. She was born #OTD in 1926. 🧵 #WomenInSTEM #NationalSTEMDay
A color portrait of Dr. Darleane Christian Hoffman (November 8, 1926 – September 4, 2025), a trailblazing nuclear chemist renowned for her work on transuranium elements and her landmark discovery of primordial plutonium-244. Captured from the chest up, she poses at a slight angle while looking directly forward with a warm, confident smile. She wears wire-rimmed spectacles, elegant white oval clip-on earrings, and a matching necklace composed of white, leaf-shaped links on a delicate silver chain. Her short, styled graying hair is neatly styled, and she is dressed in a professional navy blue top. The composition relies on classic studio lighting, which highlights her features against a textured, neutral dark gray background, evoking a formal, dignified, and intellectually accomplished mood that honors her historic significance as a pioneering woman in STEM.
4 189 643
Mr Natural
@neilmatheson66.bsky.social
1 day ago
Remembering Leonard Cohen, who left us #OTD 2016.
12 75 451
Admirable Women
@admirablewomen.bsky.social
2 days ago
At 50, she went undercover as a nurse's aid. Her resulting bestseller forced French hospital labor reforms. She spent her final years teaching youth about the Resistance through graphic novels. What a remarkable life. "The girl who saved Paris" died #OTD in 2024 at age 100. #WomenInHistory
A narrative-style photograph of an older Madeleine Riffaud (1924–2024), the legendary French Resistance fighter, war correspondent, and poet. She sits propped up in a bed or sofa, leaning slightly forward. Her expression is intensely resolute, contemplative, with sharp eyes looking upward and to the left. Her grey hair is pulled tightly. She wears a textured grey knit sweater with a dark maroon shawl covering her right shoulder. The lighting is soft and directional, illuminating her face against a dimly lit, minimalist interior background featuring a blurry framed artwork on the wall. The mood is intimate, reflective, and powerfully dignified, capturing the enduring spirit of an anti-fascist icon in her later years.
4 88 460
Robert "The Baste God" McNees
@mcnees.bsky.social
1 day ago
Physicist Lise Meitner was born #OTD in 1878. She discovered fission in uranium with Otto Frisch, and was the first person to understand both its mechanics and its implications. 🧪 ⚛️ 👩‍🔬 Image: Atomic Heritage Foundation
Black and white photo of Lise Meitner. She is standing in what appears to be a greenhouse, as there are several large plants behind her. Meitner is wearing a dark dress and blouse, with a high collar and hat. She is looking to the left of the photographer, with her hands clasped in front of her.
1 106 311
Admirable Women
@admirablewomen.bsky.social
3 days ago
#OTD in 1872, Susan B. Anthony illegally voted in the presidential election. She was arrested, eventually found guilty of illegal voting, and ordered by the court to pay $100 + court fees. She said she would never pay a penny of the "unjust penalty." And she never did. #WomensSuffrage
An engraved profile portrait of Susan B. Anthony (1820–1906), the iconic American social reformer and women’s rights activist who played a pivotal role in the women's suffrage movement. Captured from the chest up against a textured, light grey gradient background, Anthony is positioned in a strict right-facing profile pose. Her dark brown hair is parted neatly down the center and pulled back into her signature tight, braided bun at the nape of her neck. She wears a somber, dark long-sleeved dress accented by an intricate white lace collar fastened at the throat with a round, patterned metallic brooch. Her expression is deeply resolute, characterized by a firm, unyielding set mouth and an intense, focused gaze looking forward. The fine lines of the engraving emphasize a sharp jawline and prominent brow, conveying a mood of solemn determination, intellectual gravity, and historical consequence.
13 273 868
Admirable Women
@admirablewomen.bsky.social
2 days ago
#OTD in 1939, Agatha Christie's "And Then There Were None" was first published. It is Christie's best-selling novel with >100 million copies sold. It is also the best-selling mystery novel in history and one of the best-selling books of all time. #LitSky #BookSky #Mystery #Fiction
A side-by-side composite image celebrating the literary legacy of Agatha Christie (1890–1976), the world’s best-selling novelist and "Queen of Crime." The left half features a black-and-white portrait of Christie in a classic, elegant pose, looking off-camera with a serene yet sharp, contemplative expression. Her hair is styled in structured, classic finger waves, and she wears a dark top accented by a prominent pearl earring and a long, elegant strand of pearls. A luxurious fur collar wraps around her shoulders, creating a mood of mid-century sophistication and intelligence. The right half displays the iconic book cover design for And Then There Were None. The artwork depicts a dark, jagged silhouette of an island against a stormy grey-green sky, with a isolated manor house illuminated at the base. In the upper right corner, a skeletal hand reaches downward toward the island, emphasizing the novel's ominous themes of mystery and mortality. The text "AGATHA CHRISTIE" is boldly blocked in white lettering inside two slanted red rectangles at the top, while the title "AND THEN THERE WERE NONE" is written below in a clean, italicized white serif font. The overall composition bridges the author's distinguished persona with the haunting allure of her most historic masterpiece, which was first published on November 6, 1939, and became the best-selling mystery novel of all time.
5 115 395
Dr Anna Clark
@drannaclark.bsky.social
1 day ago
The Bodleian Library opened to the public #OTD in 1602. Duke Humfrey’s Library: oldest reading room in the Bodleian, named after Prince Humphrey of Lancaster, Duke of Gloucester, who bequeathed 281 books after his death in 1447. @bodleian.ox.ac.uk
1 52 220
Ceryl
@politicdormouse.bsky.social
1 day ago
Olga Lisikova, only woman in Soviet Air Force to pilot-in-command a C-47. 1934 joined aviation school, flew Po-2 & R-5s. Grad 1937, pilot 4 Aeroflot Moscow-Leningrad. #WWII Winter War evacuated wounded soldiers from front while pregnant w 1st child d. #OTD 7 Sep 2011 en.wikipedia.org/wiki/Olg….
Olga Lisikova in B&W photo wearing medals #WomenInSTEM #WomensHistory #HistSTM #HistSTEM
2 53 176

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