A globe in the corner of the podium, covered with an even layer of dust thicker than anything else in the room.

What you thinkThe entire classroom has been turned upside down—drawers, cabinets, and backpacks have all been emptied out, but this alone remains untouched. You reach out and give it a spin; it still rotates smoothly. There's a sticky note on the axis with old handwriting: "Ocean currents next week."

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