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Hands-On Science: Dissolving Sea Urchin Spines - GeekMom
As homeschoolers, we try to be open to the “teachable moment.” My sixteen-year-old didn’t exactly volunteer for this experiment, but our latest teachable moment came courtesy of the ocean, a slippery rock, a sea urchin, and his over-sized foot. When he came tromping in the house from the beach, asking if we had any vinegar, …