We need plastics - how do we avoid choking the planet with them?; Learning from tragedy - a baby lacking critical brain cells and a medical detective story; Processed food is full of bad stuff, but the real problem is you eat too much of it; 'Siri, does my baby have an ear infection?' An app does medical diagnosis; Moonquakes show the moon is still geologically 'alive; Why do Canada geese honk while migrating?