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Single-panel comic. Two stick figures stand at a shoreline, looking out over calm, rippled water. Dialogue: Figure 1: “Hey, where’s that big island we were looking at this morning?” Figure 2: “Oh, it’s underwater. The ocean’s depth here goes up and down by like ten feet every day.” Figure 1: “What?” Figure 2: “It’s because the planet has a big moon orbiting near the surface. It causes weird gravity effects.” Figure 1: “What???” Caption below the panel: “People here are used to them, but tides are one of the weirdest and most sci-fi elements of life on Earth.” Hidden text: "They're up there with coral islands, lightning, and caterpillars turning into butterflies."