The SARS virus (orange) has a crown-like structure, meaning that its part of the coronavirus family of diseases. SARS-CoV-2 has a similar shape and structure, but possesses unique features on the spiky bits: a furin-cleavage site on the stalk-like parts, and a unique receptor-binding domain at the top. The origins of these features remain only a partially solved problem. (Credit: NIH)

New evidence strongly suggests COVID is natural, not from a lab leak

We don’t know with 100% certainty where SARS-CoV-2 first came from or how it first infected humans. But not all options are equally likely.

Ethan Siegel
11 min readDec 30, 2021

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For approximately the past two years, humanity has suffered beneath the heel of a simple but world-changing organism…

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Ethan Siegel
Starts With A Bang!

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.