They might be happy. Or they aren't used to the tank yet.
Goldfish also lose their memory every 3sec. (or so I am told) The fish might jut be discovering his tank/bowl over and over and over again
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The angles around circles add up to 360 degrees
Because they make big circles around the Earth.
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The use of concentric circles is most commonly used on a target. Concentric circles are placed around a target in which each concentric circle has the same center.
A wheel