[توقف]
As you dip an empty bottle with a fish in a tank of water, the fish disappears. Why? Let’s investigate the mystery of the Hiding Fish. You’ll need a glass bottle, paper fish and a fish tank with water. Cut a fish from paper and color it. Fold and place the fish inside the empty glass bottle. Now dip the empty bottle in the fish tank water. As the bottle dips in water the fish disappears. See this action again. On removing the bottle the fish reappears. See this in close-up action. The fish disappears becaus
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