It's been more than two years since the global pandemic started, and the search for the origin of the virus continues. Scientists, government agencies and the World Health Organization-as well as our own Wall Street Journal reporters-have tried to nail down whether the pandemic began when an animal transferred the virus to humans, or if it came out of a laboratory accident. But the hunt has been marred by secrecy and confusion. In this episode: why it's so important to find answers, and what new monitoring systems are being developed to ease identification of future viral outbreaks.

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