Margaret G. Hays is a person who did some very important things in her life. She was a scientist who studied the cells in our body called lymphocytes. Lymphocytes are like little soldiers that help us fight off germs and diseases.
Margaret G. Hays studied these cells in great detail and discovered that there are different kinds of lymphocytes that help us fight different kinds of germs. She also found that some people have more of certain kinds of lymphocytes than others, which could affect how well they can fight off infections.
Aside from her scientific work, Margaret G. Hays was also an advocate for women's rights and she worked to encourage more women to pursue careers in science. She was a very smart and hard-working person who made important contributions to science and society.