AS CHINA becomes the second country to land a rover successfully on the surface of Mars, what does the Tianwen-1 mission aim to achieve? Also, our innovation editor explores the challenge of recycling old electric vehicles, and how does Victorian-era pollution still shape England’s cities? Kenneth Cukier hosts. Runtime: 26 min

Listen on: Apple Podcasts | Spotify |Google | Stitcher | TuneIn

For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience