10 women whose work is woven into the fabric of everyday life, yet whose names often stay in the shadows, have shaped everything from the paperwork of a revolution to the technology that lets us video‑chat across continents.
10 women whose inventions shape our world
10 The Declaration of Independence
No, Thomas Jefferson didn’t have a lady assistant drafting those immortal words. By mid‑July 1776 the text of the Declaration was already splashed across colonial newspapers, but the first official printed copies didn’t appear until the following January, after George Washington’s famous crossing of the Delaware and the victory at Trenton. When the Continental Congress finally distributed the document, the names of John Hancock, John Adams, Josiah Bartlett and the other signers appeared beneath a bold line that read: “Baltimore, in Maryland: Printed by Mary Katharine Goddard.”
Mary Katharine Goddard (1738‑1816) had cut her teeth publishing the Providence Gazette in Rhode Island and the Pennsylvania Chronicle in Philadelphia before taking over the Maryland Journal in 1774. During the revolutionary buildup she covered early battles, re‑printed Thomas Paine’s incendiary pamphlet Common Sense, and urged women to boycott British goods. In October 1775 she became Baltimore’s postmaster—a post she held until 1789—making her arguably the new nation’s first female federal employee.
9 Paper Bags
If you’ve ever been asked “paper or plastic?” and reached for the former, you owe a debt of gratitude to Margaret E. Knight (1838‑1914). After losing her father at twelve, she landed a job in a Manchester, New Hampshire textile mill, where within a year she invented a safety device that prevented loom shuttles from flying off and injuring weavers. Later, while working for the Columbia Paper Bag Company, she saw an opportunity to automate the labor‑intensive production of flat‑bottom paper bags, which were then hand‑folded.
Knight designed a machine that fed, cut, folded, and sealed the paper into a squared‑bottom bag. Unlike many of her contemporaries, she applied for a patent—an uncommon step for a woman of her era. When a man who had witnessed her prototype tried to claim the invention, he argued that no woman could have engineered such a device. Unfazed, Knight produced detailed blueprints while he offered none, winning the case and securing her 1871 patent. She later founded the Eastern Paper Bag Company in Hartford, Connecticut, and amassed at least twenty‑six additional patents.
8 “America the Beautiful”
Katharine Lee Bates (1858‑1929) was an English instructor at Wellesley College when a summer teaching stint took her to Colorado Springs in 1893. En route she visited the World’s Columbian Exposition in Chicago, later recalling its gleaming “White City” as “alabaster cities.” While atop Pike’s Peak with fellow professors, the sweeping vista inspired her: “It was then and there… that the opening lines of the hymn floated into my mind.”
She penned the poem “Pike’s Peak,” which appeared in the weekly newspaper The Congregationalist on July 4, 1895. Apart from a modest check for publication, Bates never received any other payment, even though her verses were set to music repeatedly. Today, her legacy lives on in Bates Dorm at Wellesley and a bronze statue facing Pike’s Peak in the Colorado Springs Pioneers Museum, though most people recognize the first stanza of her song without ever knowing her name.
7 Medical Syringe
In recent years, the humble syringe has become a household sight, yet its origins stretch back to ancient Greece and Rome, where early versions were used to apply ointments rather than inject medication. A ninth‑century Egyptian surgeon fashioned a glass tube that created suction, and by the 19th century designers had added hollow needles capable of piercing skin.
Early designs after 1844 produced bulky, two‑handed devices that required a plunger or screw to draw fluid. The breakthrough came in 1899 when New York nurse Letitia Mumford Geer (1852‑1935) patented a compact, one‑handed syringe that could be operated with a single grip, dramatically simplifying the task for both medical professionals and patients. Though little else is recorded about Geer’s life beyond her death in Kings County, New York, her invention’s basic architecture persists in modern syringes worldwide.
Geer’s contribution marked a pivotal shift in medical practice, turning a cumbersome tool into a sleek, user‑friendly instrument that helped accelerate the delivery of vaccines, insulin, and countless other life‑saving treatments.
6 Monopoly
In 1904, while employed as a secretary, Elizabeth “Lizzie” J. Magie (1866‑1948) secured a patent for what she called The Landlord’s Game. The original rules required players to roll dice, land on spaces, and pay rent, but also featured Water Franchise, Light Franchise, four railroads, and Public Parking. Each time a player passed the square labeled “Labor Upon Mother Earth Produces Wages,” they collected $100—a clear nod to the economic principles she wished to illustrate.
Magie refined her concept in a 1924 patent that introduced property names such as Lonely Lane, Rickety Row, Progress Park, and Easy Street, explicitly stating that the game was meant to expose the unfair financial advantages of greedy landlords. By the time Charles Darrow encountered a version of the board in the early 1930s, the game had already circulated in various forms for a decade.
In 1935 Darrow sold his version to Parker Brothers, falsely claiming he had created the game out of boredom while unemployed. He earned a fortune in royalties, while Magie, now married and known as Lizzie Magie Phillips, sold her patent for a flat $500, hoping to spread her anti‑greed message. Ironically, Monopoly went on to teach generations that “greed is good,” though Magie’s original intent resurfaced during a 1970s trademark dispute over Anti‑Monopoly.
5 Kevlar
Stephanie L. Kwolek (1923‑2014) discovered the super‑strong polymer Kevlar while researching lightweight materials for tire reinforcement at DuPont. Born in New Kensington, Pennsylvania, she inherited a love of fabrics from her mother and a scientific curiosity from her father. After graduating from Margaret Morrison Carnegie College in 1946 with a chemistry degree, she joined DuPont’s research labs, where she remained for her entire career.
In 1965, Kwolek’s experiments produced a cloudy solution that, when spun, yielded a heat‑resistant fiber five times stronger than steel yet remarkably lightweight. Kevlar now underpins everything from bullet‑proof vests and helmets to brake pads and aerospace components. Though she collected numerous awards and was inducted into the National Inventors Hall of Fame, Kwolek famously said, “I don’t think there’s anything like saving someone’s life to bring you satisfaction and happiness.”
4 3D Movies
If you’ve ever leapt from your seat as an on‑screen object seemed to hurtle toward you, thank Valerie Thomas (born 1943). Despite a childhood that didn’t encourage scientific study, she earned a physics degree at Morgan State University, becoming one of only two women in her graduating class. Afterward she joined NASA as a data analyst/mathematician, staying until her 1995 retirement.
While at NASA, Thomas invented an “illusion transmitter,” a device that uses two curved mirrors and a camera to project an image at two slightly different angles. The brain merges these angles into a single three‑dimensional perception. Though not the first 3D technique, her 1980 patent stood out for its elegant simplicity, paving the way for modern 3‑D cinema experiences.
3 Vietnam Veterans Memorial
When “The Wall” was dedicated in 1982 in Washington, D.C., its stark design sparked controversy, mirroring the conflicted feelings surrounding the Vietnam War itself. A panel of eight artists and designers reviewed over 1,400 anonymous submissions before selecting the work of Maya Lin (born 1959). At just 21, Lin was an undergraduate architecture student at Yale who had entered the competition as a class project.
Born in Ohio to parents who fled mainland China, Lin’s minimalist V‑shaped wall now bears more than 58,000 engraved names. Though her design earned a modest B grade, it outshone the professor’s entry, cementing her place in American memorial architecture.
2 Laser Photoablative Cataract Surgery
Patricia Era Bath (1942‑2019) graduated from Howard Medical School and had already amassed an impressive list of firsts before she patented a laser‑based cataract‑removal device in 1988, becoming the first African‑American female doctor to receive a medical patent. Her invention, the Laserphaco Probe, employs laser technology to fragment and extract cataracts, offering a faster, less invasive alternative to earlier procedures.
In 2014 the U.S. Patent and Trademark Office hailed her device as “one of the most important developments in ophthalmology,” noting that it has helped restore or improve vision for millions worldwide.
1 Voice Over Internet Protocol (VoIP)
Marian R. Croak (born 1955) earned a Ph.D. from the University of Southern California in 1982 before joining AT&T’s Bell Labs. Throughout the 1990s she amassed more than one hundred patents related to Voice over Internet Protocol (VoIP) technologies, fundamentally reshaping how we communicate.
Her work powers the electronic magic behind video chat, enabling everything from voting for American Idol to texting charitable donations. In 2022 she joined the National Inventors Hall of Fame, becoming only the second Black woman—after Patricia Bath—to receive that honor.