“I am a reflection of how a widow can thrive. I am a reflection of how widows can remain invisible…” Roseline Orwa, advocate for Kenyan widows, is star of the first episode of a new podcast series telling four stories of changemakers in a time of Covid. Oxfam’s Filippo Artuso and the LSE’s Barbara van Paassen tell us more about the series – and the research that informs it