Do colours appear the same to everyone? How does stress affect your brain? Is there a link between rheumatoid arthritis and anxiety? Why are you grumpy after a bad night of sleep? Why do some people remember things better than other people? Can I learn from a text by listening to it while I sleep?  What is fainting? Why is it easier to learn a language as a kid? What happens in the brain when you take psychedelics? Is it true that you can be ‘left-brained’ or ‘right-brained’?