Science and Brexit, Antibiotic livestock growth promoters, Bepicolombo goes to Mercury

How might Brexit affect UK Science? Why is feeding a 'last resort' antibiotic to farm animals not a good idea? Why is space probe Bepicolombo going to Mercury? Adam Rutherford is your host.This week, leading British and European scientists wrote to the British Prime Minister and European Commission President. They expressed their concerns about the potential impact if there is a no-deal departure by the UK from the European Union. We hear from one of the signatories Professor Venki Ramakrishnan, President of the Royal Society and from UK Science Minister Sam Gyimah.Roland Pease reports on the use of the medically valuable last-resort antibiotic, colistin, as a growth promoting substance in agricultural livestock feed in India. He speaks to infectious disease consultant Abdul Ghafur in Chennai, India and microbiologist Tim Walsh at Cardiff University.The space probe Bepicolombo has begun its 7 year voyage to the planet Mercury. Suzie Imber of the University of Leicester and David Rothery of the Open University tell Adam why the journey will take so long and why Mercury is such an intriguing planet, worthy of exploration by this new probe.