654877bd_erials_Science_and_Engineering__Significance
[Date] 1954 [Candidate Moment] Gerald Pearson, Daryl Chapin, and Calvin Fuller unveiled the Bell Solar Battery--the world's first device to successfully convert useful amounts of sunlight directly into electricity. [Significance] 
Serves as the very foundation for solar energy production as well as photo-detector technology.
Greatest Moments in Materials Science and Engineering
Significance