YouTube description: On the river Rhine in Switzerland, there are reaction ferries: boats with no engine, no paddles, no onboard motive power at all. Here's how they work -- and a question about what... continue reading
posted by Aard Vark![Ranked #10 - 60212 votes - 2975 star points](https://videosift.com/cdm/stars/galaxy/oritteropo.png?v=5)
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YouTube description: On the river Rhine in Switzerland, there are reaction ferries: boats with no engine, no paddles, no onboard motive power at all. Here's how they work -- and a question about what... continue reading
posted by Aard VarkUPDATE: We're still working on a species ID with our science partners at the Harvard Museum of Comparative Zoology, but currently we're thinking the purple orb is a pleurobranch, a nudibranch relative.... continue reading
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