The point in which the lineage of any two people currently alive can be traced to the same common ancestor. This point is believed to be between 5300 and 2200 B.C. While family trees are believed to be exponential, in reality there is much more inbreeding in human history. This results in a much narrower family tree and, as a result, all humans are more closely related.
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DNA Can Be Used for Pattern Recognition
In a recent paper, researchers were able to use the properties of DNA self-assembly to classify images. First, they encoded an image into DNA tiles. Then they used self-assembly to generate the shape of a letter that corresponded to an input image. The image classification which was 80% accurate.