El Niño stops carbon sink, water drag, new 'odour map'

Science correspondent Laurie Winkless joins Kathryn with three new fascinating studies. The first is into the effect extreme El Niño weather had on forest carbon sinks across South America - essentially, they were switched off. Hydrodynamic drag - that feeling of the water slowing you down when you're swimming - has been looked at by researchers at Brown University - with a finding that the drag on partially submerged objects is much higher than thought. And unlike with sight and sound, there's no way to accurately measure odour. But a new AI model has been trained to predict the smells of molecular structures - what are the implications? Laurie Winkless is a physicist and science writer.