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The Experiment

Why Water Climbs Uphill

Setup and Watch

Extend the Experiment

Quick Check

Watch colors travel up paper towels and blend into rainbows — a slow-motion display of capillary action that kids check on all day.

Set it up in 5 minutes and watch it develop for hours. Colored water travels up paper towels and blends into rainbows in real time — a live, slow-motion lesson in capillary action that kids check on all day long.

Rainbow Water Walk

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