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One of the Big Questions about SARS-CoV-2, the virus that causes COVID-19, has for a while been about its origins. Most viruses that cause disease in humans have long, fascinating origin stories, with jumps from animal to animal until they finally make it into people and start killing them.

But COVID-19, goes the theory, must be lab-grown - either from an intentional lab leak or a mistake of epic proportions - there's simply too much circumstantial evidence to ignore! This idea doesn't really make sense. There's no special reason to believe that COVID-19 must have been grown in a lab.

Sure, there's political reasons that we might think the Chinese government is untrustworthy, but that's a slim basis for a theory. As humans, when we are given two possibilities, we assume that they are somewhat equivalent in likelihood, so when you hear "lab leak or natural origin" it's not unreasonable to assume that those two things are about as likely as one another, even though that makes no sense whatsoever.

We know from decades of evidence that new diseases jump from animals to humans all the time. There are literally dozens of cases in the last few decades alone where an entirely new disease has transferred from a non-human host to people.

This has even happened twice in recent memory with coronaviruses similar to SARS-CoV-2, which gives you some idea of just how unsurprising it is when a novel pathogen of likely animal origin is identified.

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