After more than 35 years on air, and outstanding critical acclaim, it is a world leader in its field. Its target is the general audience, rather than the scientific community - although it always reflects accurately the world of scientists, and strives to maintain a loyal following amongst them. Such a narrative approach means that any viewer can be interested in a film, whatever the subject. Films that rely on the attraction of the subject alone always require a motivated audience.
Good stories appeal to anyone.
What is tricky is to find a 50-minute story which requires the viewer to gain insight into science in order to follow that engaging story. A reason why it matters, and matters to tell it now. Reasons can be many and various, but they must be there. It can be something that is politically important, or medically challenging, or it can simply be such a powerful story that it reveals something about the human condition - and that is something we all care about.