Neuroscientist David Eagleman points out how our brain - and our beliefs - affect what we see.

This week Mary-Lou and I were at the Watford UTC talking to two groups of 14-year-old students. They loved the visuals - especially the optical illusions which really scrambled their brains. Afterwards Mary-Lou unscrambled their brains, and showed them ways of thinking flexibly.

Such an inspiring and progressive college - with 60% of the students going on to University. Having never set foot in a school since I left mine (circa 1951), the tour so far has been incredibly eye-opening. And I get to show students little films on my portable projector, which adds to the joy.