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By Amy Cowen on March 13, 2014 11:00 AM
Two photos show four drops of food coloring moving across the surface of milk in a plate

What causes the food coloring to move through the milk?

In this week's spotlight: a family science experiment that lets you and your children make a rainbow in keeping with St. Patrick's Day! What happens when you put drops of food coloring in milk? What happens when you add a bit of dishwashing liquid? Put it to the test in this science activity for a fun, colorful look at the role of a surfactant and how it changes the surface tension of a liquid.

Family science activity:

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