However fish that needs to travel upstream have a hard time. It can be solved to... | Hacker News

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		fetbaffe on April 1, 2015 \| parent \| context \| favorite \| on: Costa Rica Is Now Running on 100% Renewable Electr... However fish that needs to travel upstream have a hard time. It can be solved to some extent.

sjwright on April 1, 2015 [–]

With cannons.

https://www.youtube.com/watch?v=kICS32kady4

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