21:00BBC Inside ScienceEarth's Earliest Life, The Benefits of Pollution, Sexuality and Science and New ideas on EvolutionBBC Radio 4 Duration: 30 minutes Thu 2nd Mar 2017, 21:00 on BBC Radio 4 LWAvailable for over a yearListen nowThe World's oldest sedimentary rocks reveal traces of our earliest ancestors. Show more GenresFactualScience & NatureBrandBBC Inside Science Source: BBC Online