Photo: CAIA IMAGE/SCIENCE PHOTO LIBRARY
Science commentator Laurie Winkless joins Kathryn to talk about how we measure time and a new paper which suggests melting water from polar regions could be affecting the Earth's rotation - what impact could it have?
Researchers have found preserved microbes in two teeth dating back 4000 years - what does it tell us about how the bacteria that live in our mouths have changed over time?
And how computer modelling is being used to identify and predict what makes a beer popular.
Laurie Winkless is a physicist and science writer.
