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
It is one of the most powerful involuntary actions the human body can perform. But is a big sneeze a sign of illness, pollution or something else entirely?
Experts say dangerous sleep apnoea affects an estimated 8 million in the UK alone, and everything from evolution to obesity or even the climate crisis could be to blame