Magic Goo

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Ages: 18 months and up

Is this mystifying blend of cornstarch and water a liquid? A solid? Truth be told, it's both! When kids apply pressure -- as when rolling it into a ball -- the mixture magically firms up. But release that pressure, and it will dribble right back out through their fingers. Here's how to easily whip up a batch of your own, because in this case, feeling really is believing.

What you'll need

  • Cornstarch
  • Water

How to make it

  1. Pour 1 cup of cornstarch into a shallow bowl or pan. Add 3/4 cup of water a little at a time, stirring as you go.

Additional Instructions

To Play

Show your toddler how to scoop some of the mixture into her hands and then roll it into a ball, much as you would roll a handful of cookie dough. The consistency is key here, so if your magic goo doesn't firm up when you roll it, add a little more cornstarch. Likewise, if it doesn't melt back out of your hands when you release the pressure, add some water, about 1/2 teaspoon at a time.

To Store It

When your child is done playing, leave the mixture sitting out for several hours. Once it's dry, crumble it into a sealed container. Just add water to play again another day
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