Final answer:
Raymond Dart was a South African anatomist and anthropologist who discovered the first Australopithecus africanus skull, providing evidence for the theory of human evolution. He also made important findings about the properties of cathode rays.
Step-by-step explanation:
Raymond Dart was a South African anatomist and anthropologist who made significant contributions to the field of paleoanthropology. He is best known for his discovery of the first Australopithecus africanus skull, which he called the Taung Child, in 1924. This fossil provided crucial evidence for the theory of human evolution and challenged prevailing views at the time. Dart's finding supported the hypothesis that the cathode ray consisted of a stream of particles, which contributed to our understanding of the properties of cathode rays.