If you've ever observed "wine legs," the rivulets that form when you swirl wine in a glass, you've seen the Marangoni effect. Watch how scientists are using this effect to create tiny motors that emit no pollutants.
Here's a fun explainer for young people that includes how to make a boat propelled by the Marangoni effect:
• Wine “legs” and minibot motors (YouTube / American Chemical Society)
Wine image: torbakhopper
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