When you're an expert in a subject, you can retain new factoids on your favorite topic easily. This only works for the subjects you're truly passionate about, though. Baseball fans can reel off stats for their favorite players, then space out on their own birthday.

In this quote, Clive Thompson explores the idea of expertise and how passion for a subject influences memory and retention. He suggests that when you're an expert in a particular area, such as a hobby or field of study, you are able to easily absorb and retain new factoids related to that topic. This phenomenon happens because deep interest and engagement with a subject enhance one's ability to remember information that feels personally relevant or exciting.

Thompson further emphasizes that this ability to retain information only applies to topics you are truly passionate about. For example, a baseball fan might have an impressive recall of statistics about their favorite players or teams, as they are deeply invested in the sport. However, this same person might easily forget something as significant as their own birthday, demonstrating how passion and focus on a specific subject can sometimes overshadow other details that are less emotionally engaging or important to them.

The quote highlights how passion influences focus and cognitive ability. When people are deeply connected to a subject, they become more adept at remembering the related facts, but their attention may narrow to the point where they lose track of things outside their immediate area of interest. This serves as a reminder of how our brains prioritize information based on emotional connection and interest.

Ultimately, Thompson’s statement reveals how expertise is not just about intellectual ability, but also about the emotional investment that drives someone to engage deeply with a topic. It speaks to the way in which our passions can shape what we remember and how we experience the world around us.