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Why is it easier to remember that I’ve forgotten something than to remember what I’ve forgotten?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Why is it easier for me to remember that I’ve forgotten something than to remember the thing I’ve forgotten? John Gray, York

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.