Games can be powerful. They can be thought-provoking. They can be emotional. And they can teach. We might shake our heads at so-called "educational games", but they have proven themselves an effective way to inform and engage where other, more formal methods fail, especially when it comes to children.

Which is why projects like Vaxcards -- a competitive card game with multiple complexity levels, cooked up by a pair of Australian medical professionals, is so important in a climate where immunisation, once an unquestioned given, has found itself -- somewhat quizzically -- under assault.