Conducted research on the developmental effects of prejudice, discrimination, and segregation on children in the 1950s. the research was cited by the u. s. supreme court in its decision in the landmark brown v. board of education case.

kenneth clark

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