1 What are T W Engelmann and Melvin Calvin famous for?

T.W. Engelmann is famous for his work in the field of plant physiology, particularly for his experiments demonstrating the process of photosynthesis using a microscope, which helped identify the role of chlorophyll in capturing light. Melvin Calvin is renowned for the Calvin cycle, the series of biochemical reactions that occur during photosynthesis, which he elucidated through his research on carbon fixation in plants. Both contributed significantly to our understanding of how plants convert light energy into chemical energy.