In the past 20 years, researchers have come to understand the many benefits of a little personal nostalgia – the feeling of pining for elements from your own past. We have adapted work by psychologist Krystine Batcho to help you figure out how nostalgic you are, and what that says about you. If this fun quiz makes you curious to learn more, try the iPhone and iPad Nostalgia Inventory app, which is also based on Batcho’s work.