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In the beginning, Yvonne worked part-time jobs so that she could care for their three young children. Yvonne Brill is believed to be the only woman in the United States who was researching into rocket science in the mids. Yvonne encountered her fair share of prejudice and discrimination.

She was paid a salary below that of men. For the last twenty years of her life, Yvonne C. In part, Yvonne's reason for going into rocket engineering was that virtually no other women were doing so. During her lifetime, Yvonne C.

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Yvonne C. Brill developed the concept for a new rocket engine. She called it hydrazine resistojet.

Resistojet is a method of spacecraft propulsion that provides thrust by heating a non-reactive fluid. In , Yvonne Brill designed and invented the hydrazine resistojet propulsion system. Yvonne Brill patented her propulsion system for satellites in She received U. Patent number 3,, for her invention. The first communications satellite using Yvonne's invention was launched in Her invention is still being used by satellites that handle worldwide phone service, long-range television broadcasts, and other tasks.

Yvonne Brill's invention became a standard in the industry. It has brought millions of dollars of increased revenue for commercial communications satellite owners.

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Brill died of complications of breast cancer in Princeton, New Jersey on March 27, , at the age of Hertha Ayrton is best known for her work on sand ripples and electric arcs. Phoebe Sarah Marks adopted the name Hertha in her teenage years, after the ancient Germanic earth goddess. She was the third of eight children of a Jewish watchmaker and jeweler who had emigrated from Poland to escape the pogroms.

Her father died when she was seven, leaving her pregnant mother and her six brothers in poverty. Marks was of the idea that women needed a better not worse education than men, because "women have the harder battle to fight in the world. When Sarah was nine years old, her mother allowed her to go to London to live with her aunt Marion Harzog, who ran a school and had invited Sarah to go and study with her cousins who introduced her to mathematics. At 16, Sarah was working as a governess in order to support herself and her studies which she was determined to advance further. She passed the Cambridge University Examination for Women in with honors in both English and maths.

However, the University of Cambridge did not give degrees to women at the time, so she received her degree in science through the University of London in , instead. Hertha was known for her fiery personality and for pioneering women's education and the first residential college for women established in England.

Hertha was a close friend of Marie Curie. She famously wrote: " Errors are notoriously hard to kill, but an error that ascribes to a man what was actually the work of a woman has more lives than a cat" after Marie's discovery of radium was attributed to her husband. Hertha also conducted a vigorous campaign in the press.

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The writer was a keen supporter of education for women and she took an interest in Hertha's efforts to fund a place at Girton College. Hertha Ayrton earned money by teaching and embroidery. In , Hertha began attending evening classes at Finsbury Technical College where she met her future husband, Professor William Edward Ayrton who was a pioneer in electrical engineering and physics education and a fellow of the Royal Society.

After marrying William Ayrton in , Hertha began assisting him with experiments in physics and electricity. Hertha also began her own research on the characteristics of the electric arc. Hertha wrote articles on her research for The Electrician. In her articles, she explained that the problems with the electric arc were the result of oxygen coming into contact with the carbon rods used to create the arc. A few hours later, she was elected the first women member of the IEE. The next woman was admitted to the IEE in It was not before the late 19th century that Hertha Ayrton's work in the field of electrical engineering was widely recognized not only in England but also internationally.

In , Hertha Ayrton developed a device to blow away poisonous gases from the trenches, keeping soldiers fit. More than , of the fans were used on the Western Front.

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Other inventions include mathematical dividers, arc lamps and electrodes, and propulsion of air. Hertha's first major invention was the line-divider. Her invention was an engineering drawing instrument for dividing a line into any number of equal parts and for enlarging and reducing figures. The primary use for line-divider was for artists for enlarging and diminishing. However, it was also widely used by architects and engineers.

Hertha's invention was shown at the Exhibition of Women's Industries receiving significant press attention. In , Hertha patented her first major invention: the line-divider, an instrument used for dividing lines into a number of equal parts. Other patents include five on mathematical dividers, 13 on arc lamps and electrodes, and the rest on the propulsion of air. In , Hertha began researching highly luminous and intensely hot discharges of electricity between two electrodes.

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Arc lamps were used for public lighting at the time but they would flicker and hiss on the streets. Hertha's work led to fixing this issue by binding the arc together to form one constant whole. Hertha Ayrton has received many awards and honors in her lifetime and after her death. Hertha's certificate seems to have been the first in the history of the Society to be submitted in favor of a woman, and 41 years were to elapse before the next. Hertha Ayrton is still the only woman to have received this medal. In , an English Heritage blue plaque was unveiled at 41 Norfolk Square in Paddington, where Herta lived, to commemorate her.

Hertha Ayton died of blood poisoning caused by an insect bite on August 23, , in Bexhill-on-sea, Sussex, England.

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She was Sarah Breedlove, known as Madame C. Walker , was born in to a family of slaves on a plantation in Louisiana. Sarah Breedlove became an orphan at the age of seven after both her parents died from yellow fever. Aged 33, Sarah started her business career selling the first hair products known as Madame C. Walker Vegetable Shampoo. Her line of hair treatment, maintenance, scalp stimulation, and beauty products mainly targeted at black women focused on the need for a healthy and clean scalp, something not always possible due to living conditions back then.

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  4. She recruited 25, black women by the early s from North and Central America, and the Caribbean as door-to-door beauty consultants. As her hair loss increased rapidly, Madame C. Walker developed a formula mixing petroleum —similar to vaseline,— sulfur, and a little perfume to make it smell better. She used this formula to treat the severe scalp disease, a common disease of the time, which was causing the hair loss. After the successful results, Madame Walker started bottling the formula and selling it door-to-door to other African-American women suffering from the same disease.

    Madame C. Walker did not patent any products herself.

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    The Madame C. The company was successful and it became famous for its African-American cosmetics and hair care products invented and developed by Madame C. Walker Company was considered the most widely known and financially successful African-American owned business of the early twentieth century. In , the Madame C. Walker Company ceased operations. An estimate of around 40, African-American worked for Madame C.

    Walker over the years that the Madame C. Walker was active. A pioneer of the modern cosmetics industry, Madame C. In , Sundial Brands launched a new line called Madam C. Walker Beauty Culture which is sold exclusively in Sephora stores and at Sephora. I want to say to every Negro woman present, don't sit down and wait for the opportunities to come.

    Get up and make them! A remarkable woman, who fought against racism, she used her wealth to support African-American institutions, the black YMCA , helped people with their mortgages, donated to orphan and senior citizens homes, she wanted to found a school for black girls in Nigeria although she was not able to do it. She thought educating young girls and women would make a difference in society. Walker, who is considered one of the most successful African-American entrepreneurs throughout history , passed away at the age of 51 from kidney failure in She is known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine.