Pen ink on a leaf 🍃 zooming through a puddle
The ink-mixed water behind the leaf has a lower surface tension than the water in front of it. While this gradient tries to equalize (Marangoni effect), the different adhesive forces around the leaf pull it along. (Source)
Look at it go!
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“Classifications of animals expressed as a genealogical tree.” Biology for Everyman. 1934.
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