Description: [caption id="" align="aligncenter" width="229" caption="Mary Alice McWhinnie (1922-1980) was a professor of biology at DePaul University and a world-renowned authority on krill when she began working on research ships off-shore in 1962, when this photograph was taken, by Unidentified photographer, Black and white photographic print, Smithsonian Institution Archives, cc. 90-105
Description: 100 years ago in August of 1914, the Panama Canal opened to commercial shipping. Smithsonian scientists knew the canal would create major environmental changes and have spent the last 100 years documenting them.