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#OTD in 1992, Dr. Mae Jemison launched into orbit as a mission specialist aboard the Space Shuttle Endeavour making her the first Black woman to travel into space. An incredible life: + Physician (M.D., Cornell 1981) + Peace Corps Area Medical Officer in Sierra Leone & Liberia #WomenInSTEM 🧵

A classic NASA color portrait of Dr. Mae Carol Jemison, the first Black woman in space, captured in her official astronaut attire. She stands confidently in the center of the frame wearing a vibrant orange NASA flight suit with the American flag patch on her left shoulder, a blue-and-red NASA worm logo on her right, and a name tag reading “MAE JEMISON” above a mission patch. A large circular mission insignia for STS-47 (“Gibson APT Brown / Lee Davis Jemison Morgan”) is visible on her chest. She holds her white-and-black astronaut helmet with both hands in front of her torso, her short dark hair neatly styled, and offers a warm, radiant smile that conveys pride, determination, and joy. The background is a softly blended blue studio backdrop evoking the vastness of space. The composition blends technical precision with personal warmth, celebrating her historic 1992 flight aboard Space Shuttle Endeavour as Mission Specialist, where she conducted experiments in materials science and bone cell research. The image powerfully symbolizes her groundbreaking contributions to space exploration, diversity in STEM, and her lifelong commitment to making science accessible to all.A color portrait of Dr. Mae Carol Jemison, the first Black woman to travel into space and a pioneering engineer, physician, and advocate for science education. In this warm, studio-lit photograph from 2013, she appears as a confident woman with short, stylishly layered dark hair, smiling directly at the camera with a bright, engaging expression that radiates warmth, intelligence, and approachability. She wears a soft blue V-neck top, large silver hoop earrings, and a striking black cord necklace featuring a prominent circular turquoise pendant that rests at her collarbone. The background is a smooth, neutral gradient, keeping the focus entirely on her poised and professional presence. The overall composition is intimate and celebratory, conveying quiet strength and accomplishment while highlighting her enduring role as an inspirational figure in STEM and in women’s history.

#CivilRights activist Claudette Colvin was born #OTD in 1939. On March 2, 1955, she was arrested for refusing to give up her seat on a bus in segregated Montgomery, AL. She was 1 of 4 plaintiffs in Browder v. Gayle that led to the ruling that Alabama bus segregation laws were unconstitutional.

A black-and-white historical composite image honors civil rights pioneer Claudette Colvin (born September 5, 1939). On the right is a head-and-shoulder portrait of Colvin as a 15-year-old girl. She faces forward with a calm, resilient expression and a slight, dignified smile. She wears thick, dark-rimmed cat-eye glasses, and her short, textured hair is styled in neat waves. Her dark sweater contrasts softly against the plain, light background. On the left side of the composition are archival clippings from a 1955 newspaper article reporting on her arrest. Bold headlines read "Girl, 15, Guilty In Bus Seat Case" and "Negro Girl Found Guilty Of Segregation Violation," detailing her conviction in juvenile court for refusing to give up her seat on a segregated Montgomery, Alabama bus. The stark juxtaposition of her bright, youthful face against the harsh segregationist headlines creates a poignant, solemn mood, underscoring her monumental bravery as a key catalyst for the Montgomery bus boycott.

Computer scientist Margaret Hamilton coined the term “software engineer.” She directed the Software Engineering Division at MIT’s Instrumentation Lab & led development of the on-board flight software for NASA’s Apollo Guidance Computer. She was born #OTD in 1936 & turns 90 today! #WomenInSTEM

Two side-by-side black-and-white photographs of pioneering computer scientist Margaret Hamilton (born August 17, 1936). The left panel features a mature, close-up portrait where Hamilton gazes directly at the viewer with a serene, confident, and reflective expression, framed by her long, dark, slightly silvering hair. The right panel is a famous archival photograph showing a younger Hamilton standing indoors next to a towering stack of bound paper binders containing the Apollo Guidance Computer source code, which she led the development of at MIT. She is smiling broadly and wears a striped, long-sleeved mini dress with dark Mary Jane shoes and glasses, resting her hand proudly on top of the massive column of printed code. The overall composition contrasts her youthful triumph with her enduring legacy, capturing an optimistic, intellectually rigorous mood that highlights her monumental contributions to space exploration.