Water drop races are a quick science project that demonstrates the concept of surface tension. An alternative to the penny drop experiment.
Surface tension coin and speedboat experiments
Solving Film Defects with Surface Tension Modifiers
The Dynamic Surface Tension of Water The Journal of Physical Chemistry Letters
Surface Tension Experiment - Science for Kids
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Simple Science Experiments: Fun with Surface Tension - MetroFamily
Surface Tension with Toothpicks
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Drops on a coin : Fizzics Education
Hydrophobicity: Will the Drop Stop or Roll? - Science Friday
Mysterious Water Suspension - Steve Spangler
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Surface tension hi-res stock photography and images - Alamy
7 Science Tricks with Surface Tension