was born in Easton, Pennsylvania. Florence was a young child when
she became ill with polio. She walked with a limp after her recovery,
but did not let that stop her from living a full, busy life. As
a teenager, Florence enjoyed reading biographies about famous scientists,
so it seemed natural that she would go to college to become a scientist.
She earned an A.B.
from Gaucher College and a Ph.D. in biochemistry from Yale University.
While working on her doctorate, she discovered that intravenous
injections made with contaminated distilled water could cause fevers
in patients, so she invented a new distillation process that eliminated
all bacteria. In 1923 Siebert went to the University of Chicago.
From 1924-28 she became a pathology instructor. She became an assistant
professor of biochemistry in 1928. Between 1937 and 1938 Florence
studied at the University of Uppsala in Sweden. Her work in science
during this time frame proved to be very helpful in the development
of a reliable way to test people to see if they had TB. This same
skin test for tuberculosis is still in use today and has helped
save many lives.