As dementia progresses, large studies show that a simple hobby could lower the risk of getting sick. From Australia to Japan, does the way we spend our evenings change the destiny of our brain? They seem innocuous. A crossword puzzle in the evening, a few rows of knitting in front of the television, a game of cards with friends or a few hours spent in the garden. Yet behind these familiar habits, researchers are beginning to see more than just entertainment: possible protection against dementia. As neurodegenerative diseases progress around the world, several large studies reveal how our leisure activities could influence brain aging.