They then discovered that they had made a strange substance, which sometimes behaved like a liquid, yet sometimes behaved like a solid! It is called Oobleck.
Hopefully you can see that when they applied pressure, they could make it into a solid ball, which they could hold, but as soon as they eased off the pressure, it became a liquid again and ran through their fingers!
A great time was had by all, including Mrs Ellis, who was absolutely covered in cornflour and Oobleck!
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