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
On the weather forecasts, they always say: “With the wind, it’ll feel like …” How is the wind-chill factor calculated? Mick Rawlinson, Brighton
Post your answers (and new questions) below or send them to firstname.lastname@example.org. A selection will be published on Sunday.