Get lots of natural light, not too much direct sun, and avoid blue light at bedtime. Those are the simple rules to live by when it comes to our ancient and complex relationship with the sun. Glowing screens, indoor lifestyles and fear of the dangers of UV rays have changed our interaction with natural sunlight. Science writer Linda Geddes shares the latest research on what’s good for us and what’s not in her book, Chasing the Sun: The New Science of Sunlight and How it Shapes Our Bodies and Minds.