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 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 people become leftwing or rightwing? Is it nature or nurture? Jane Shaw, France Send new questions to nq@theguardian.com . Become leftwing? I was