Who doesn't have a belly button?
The newspapers call it the "riddle of the £2.5m beauty". The beauty in question is Czech supermodel Karolina Kurkova. The riddle is her non-existent belly button.
Its absence was noticed this week when the 24-year-old graced a US catwalk for lingerie giant Victoria Secret. While most of us have an "outie" or an "innie", Ms Kurkova has a smooth indentation (although sometimes a tummy button is airbrushed onto her photos in post-production).
Otherwise known as a navel, the belly button is the rounded, knotty depression in the centre of the abdomen caused by the detachment of the umbilical cord that fed you while in the womb. We all have umbilical cords, so why don't we all have a belly button?