Dealing with drought

As parts of England enter drought conditions we ask what are the drivers for drought and what can we do about it? With Dr Jess Neumann, Hydrologist at Reading University, Aidan McGivern meteorologist at the Met Office and Professor Richard Betts, Chair in Climate Impacts at University of Exeter.What influence do Scientific Advisors really have on government? We explore the tricky issue with science writer Philip Ball.Are there just too many satellites now orbiting the earth? Astronomers are increasingly finding their presence is interfering with astronomical observations. Jane Chambers reports from Chile.And what is mucus actually for and how did it evolve? Omer Gokcumen, Associate Professor of Biological Sciences and Stefan Ruhl, Professor of Oral Biology at the University at Buffalo reveal its origins in our aquatic ancestors and its vital role in mouth hygiene. Presented by Alex Lathbridge Produced by Julian Siddle Assistant Producer Emily Bird