I think this article does a good job properly presenting what evidence we have: https://www.nature.com/articles/d41586-020-02801-8 https://www.nature.com/articl

I think this article does a good job properly presenting what evidence we have: https://www.nature.com/articles/d41586-020-02801-8 https://www.nature.com/articles/d41586-020-02801-8