Hop On Pop, Jump On Oobleck

Even amateur cooks know that cornstarch is clutch when it comes to thickening Thanksgiving gravy or homemade soup. But as amateur (geeky) thrill-seekers have discovered, filling a swimming pool with cornstarch and water leads to a strange and fun phenomenon: You can run and jump across the sort-of-solid surface. Stop for a second, though, and you’ll sink like a stone. But the abnormal behavior of this “oobleck” (yes, it’s named after...

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