Last week a US congressional committee began what could be a months-long probe into the origins of the coronavirus pandemic. Was it the result of a lab leak in Wuhan? And did Dr. Anthony Fauci and his team of experts carry out a cover-up in the early days of the outbreak? These are the questions the Republican-led committee are trying to answer. Today on Front Burner, The Atlantic’s Daniel Enger on the shifting narratives around the origins of COVID-19 -- and how it went from the fringes to the mainstream. For transcripts of this series, please visit: https://www.cbc.ca/radio/frontburner/transcripts