Are you a Princess Barbie jelly-baby who likes frilly dresses, high heels and takes ages to get ready? Or a GI Joe jelly-baby who wears boots and functional clothing? Did you know that your preference for pink sparkles or muddy sports isn’t down to societal expectations of boys and girls. No, it’s written in your chromosomes. And that’s science.

Well, science according to Mermaids, the charity for trans children, in a presentation understood to be given to thousands of teachers, health workers, police and politicians, and part-funded by the Department for Education.

I listened to a recording of this bizarre 90-minute training lecture and wish others could too. Particularly those who pride themselves on rationality and evidence-based thinking: atheists, fans of Richard Dawkins and Ben