654877bd_erials_Science_and_Engineering__Significance
[Date] 3000 BC (estimated) [Candidate Moment] Metal workers in the region of modern Syria and Turkey discover that addition of tin ore to copper ore before smelting produces bronze. [Significance] 
Establishes the concept of metals alloying--blending two or more metals to create a substance that is greater than the sum of its parts.
Greatest Moments in Materials Science and Engineering
Significance