That doesn't mean there's anything to worry about. The risk of a dangerous new variant of the virus is very real.
Scientists are still looking for clues as to where and why covid-19 started.
It is a pleasure to welcome you to Curious Coincidence. The story of the hunt for those clues is told in a five-part podcast. The story is hosted by our senior editor for biomedicine, Antonio Regalado, and is about people in labs doing sensitive research on dangerous germs and the crisis they are in.
It is a story about why people are silent and why they speak out. The science that allowed us to develop vaccines quickly may be what got us into trouble in the first place.
Why is it so hard to find out what happened?
If you don't know what your history is, you can't learn from it.
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