A woman (ie. Barbora Skrlova) who supplied a Czech passport enrolled her son "Adam" at the Marienlyst school near Oslo last September, authorities said.

Adam was actually the 160cm-tall Skrlova, her breasts bound and head shaved, authorities said.

School authorities said they did notice Adam's strange behaviour.

"We did react to Adam's behaviour. But it's not easy to know. Children at that age can be so different," school principal Ingjerd Eriksen told the Oslo newspaper Dagbladet.

I think you, like me, want to know the answer to the inevitable question: just what was Adam's strange behaviour?

His unusually thorough knowledge of music from the 1980s? His odd insistence on a pre-class cup of coffee & a smoke? His quirky tendency to avoid school urinals? Or, indeed, his wilful menstruation?

Enquiring minds.