A waterworld with a boiling ocean and the end of dark matter? The week in science

Ian Sample and science correspondent Hannah Devlin discuss some of the science stories that have made headlines this week, from a new theory challenging the existence of dark matter to an alarming study about the possible impact of microplastics on our health and a glimpse of a ‘waterworld with a boiling ocean’ deep in space. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>