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In this six-panel stick-figure comic, two characters appear: one wearing a small hat, the other without. In Panel 1, both are shown in silhouette walking across a grassy hill, with no dialogue. In Panel 2, while walking on a gentle slope, the hatted figure says, “I learned something today. I went on one of those family tree sites and kept clicking back, and it turns out I’m related to stromatolites!” In Panel 3, the figure without a hat asks, “The bacterial mats?” and the hatted figure replies, “Yeah! A few billion years back, on my mitochondria’s side.” In Panel 4, the hatted figure explains, “My archaean ancestors absorbed some bacteria that were cousins of stromatolites. That’s how I got mitochondria. Cell nuclei, too.” In Panel 5, the figure without a hat says, “I think there are still living stromatolites. You could get in touch.” and the hatted figure, now sitting down, responds, “Nah, they’re probably busy. I don’t want to bother them.” In Panel 6, both figures lie on the hill in silhouette. The figure without a hat asks, “So what ARE you going to do with this knowledge? Nothing?” and the hatted figure answers, “Lying on a hill in the warm sun is an old family tradition.” Hidden text: "If only my ancestors had been fortunate enough to marry into the branch of the bacteria family that could photosynthesize, like all my little green cousins here."