My prank demonstrated how our minds can adversely affect our health, and scientists are increasingly showing that negative thoughts can produce very real symptoms, says science writer Helen Pilcher
It is one of the most infectious diseases around, and can cause blindness and hearing loss – and can also be fatal. Why are cases now soaring and what can be done about it?
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?