Alarmed by the rapid decline of wild salmon populations, a company has invented a novel way to help migratory fish over blocked rivers. It uses air pressure to fire them out of a cannon.
Source: http://www.npr.org/blogs/thesalt/2014/08/29/344360634/the-salmon-cannon-easier-than-shooting-fish-out-of-a-barrel?utm_medium=RSS&utm_campaign=science
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