Language learning + ageing, fuel CO2 levels hit record

Science commentator Laurie Winkless joins Kathryn with a new study that looked at 86,000 people in 27 European countries to understand how multilingualism may influence their brain health as they age. The results might just have you reaching for the Duolingo app. This year's Global Carbon Project has found emissions from fossil fuels have risen by 1.1% to reach their highest level yet. And there's new hope for people suffering from anaemia; researchers in Switzerland have developed a new iron supplement for food that's tasteless and more quickly absorbed than iron sulfate. Laurie Winkless is a physicist and science writer.