Conspiracy theories about the origins of COVID-19 have been circulating since start of the pandemic that's killed more than 3.5 million people.
Speculation it was caused by a laboratory accident in the Chinese city of Wuhan has now gained currency once again.
That's after President Joe Biden ordered U.S. intelligence agencies to find out more.
Earlier this year, a W.H.O. report concluded the lab theory was "extremely unlikely".
While acknowledging its scientists faced difficulties.
Beijing has already dismissed the probe - saying it's a disrespect for science.
So, can U-S intelligence officials succeed where health experts have failed so far?
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