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In this meeting, I am going to summarize my thoughts and experiences on sedimentary / environmental ancient DNA (sedaDNA) studies using the paper of Wang et al., Nature 2021, as an example. This area rapidly grew into an independent branch of palaeogenetics delivering unprecedented information about hominin, plant and animal evolution without bone artifacts. I am going to give a brief overview of a few recent milestone studies, and concentrate on challenges of discovering organisms in sedaDNA samples that typically do not have a clear host. In particular, I will discuss