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how did katherine johnson overcome racial prejudice

Overcoming the constraints of segregation and gender bias, she progressed from mathematical tasks, such as computing experimental flight and ground-test data using a mechanical Frieden calculator for the NACA, to the application of spacecraft trajectories and spacecraft control calculations for NASA.

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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