The most common definition of a prime number used in school seems to be 'an integer whose only factors are one and itself', which unfortunately leaves open the question of whether one is itself a prime number. Until the nineteenth century, most mathematicians regarded one as a prime number – Henri Lebesgue (1875–1941) is often said to be the last professional mathematician to call one prime – so it is a little unfair to regard learners as silly for thinking this today, or for questioning why we do not now regard one as a prime number – it is still a good question.

But he wore surgical gloves when we had sex, I mean if we had had a body condom he would have wore it and he'd go wash immediately.

Used from mobile network operators' (MNOs) usual base stations, these waves work well in open country, which gives passengers a decent service. But DfT's report says that MNO base stations are not optimised for railways.

So what's the connection? Probably the best place to start is to walk down the hall and ask the world's foremost expert on biocompilers, who is currently playing with an eight-year-old child […]