Can a brain scan show whether people are already producing their language response while their conversation partner is still speaking? Do some people have stronger mental imagery than others? And does this affect how they learn? Do colours appear the same to everyone? What is the effect of a visual impairment on the brain? And is there anything we can do to restore it? Is dopamine good for you and serotonin bad? Can you unlearn sleeping in the dark? How is a neuron made?  Do we produce new neurons in our adult brains? Or does this stop at a certain age? Can I learn from a text by listening to it while I sleep?  Is the brain more or less active during sleep?