China's new London embassy, and screen-time retards speech

This week, China's attempts to build a new "mega-embassy" in London, but are there security risks? Plus, the UK plans to build a record number of offshore wind farms for cleaner energy, the impact of TV screens and tablets on speech development in toddlers, and NASA's first-ever medical evacuation from the International Space Station... Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)