The human brain is a marvel of complexity. It contains specialised and interconnected structures controlling our thoughts, personality and behaviour. The size and shape of our brains also play a crucial role in cognitive functions and mental health. For example, a slightly smaller hippocampus, the structure responsible for regulation of memory and emotion, is commonly seen in depression. In dementia, atrophy of the hippocampus is correlated with memory loss and cognitive decline. Despite these insights, we have only scratched the surface of understanding the brain and its connection to mental health. In collaboration with scientists around the world, we have…