Cover-ups, coincidences, and conspiracy theories: where did Covid come from?
As a deadly new virus starts spreading in Wuhan, China, so do rumours about a lab there.
A team of top scientists ask where Covid came from. But can they trust data from China?
US President Donald Trump wades into the Covid origins debate.
A World Health Organization team heads to Wuhan. Will they find the truth?
The lab leak theory goes mainstream. How safe are top-security laboratories?
What really went on in that Wuhan market - and the curious case of the raccoon dog.
Mysterious deaths in Soviet Russia and what they might tell us about the origin of Covid.
Speculation that newly declassified US intelligence will contain smoking-gun evidence.