I need the answer to a riddle can you help?

The riddle is this... What goes around the world, but stays in the corner? or:The riddle is this... What goes around the world, but stays in the corne

The riddle is this... What goes around the world, but stays in the corner?

or:The riddle is this... What goes around the world, but stays in the corner?

or:A stamp. It stays in the corner of an envelope, and goes around the world.

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