How does our breathing influence how we think and feel? How is it that some people see an object as blue, while others say that same object is green? When are we able to solve MS? Do we really have a reptile brain, a mammal brain, and a human brain inside our heads? What is the effect of a visual impairment on the brain? And is there anything we can do to restore it? Why do Dutch people say “I have sawdust in my head” when they do something stupid? Can you unlearn sleeping in the dark? What happens in the brain when you take psychedelics? Do colours appear the same to everyone? Why is sleep so essential?