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 so tempting to pick a scab? Our bodies create them to help wounds heal, yet those same bodies make us want to remove them. Tabitha Stubbs, Liverpool
Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.
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