A brilliantly done talk - I've been looking forward to this kind of tech for about ten years now, and it's amazing to see it finally coming to fruition.
The most dangerous time to be wielding a credit card is, according to Professor Karen Pine, the ten days before a woman's period - the "luteal phase" - during which they're more likely to splash out as a way of handling the "negative emotions created by their hormonal changes", as the BBC puts it.