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 do many of us have the tendency to want, or need, to pee when we hear running water? Is this equal between female and male, and does age affect the phenomenon? David Cockayne, Cheshire
Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published on Sunday.