What challenges did katherine johnson face while working at NASA

The main challenges faced by Katherine Johnson were segregation and discrimination. As an African-American, she was faced with segregation as a child, due to her ethnicity. When she worked at NACA, she not only was discriminated because of her race, but also her gender.

yes, there are senators in each state

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on