When we added family-graph pattern matching, one of our early users — Ada, in Kuala Lumpur — connected her mother and her maternal grandmother to her archive.
Within two weeks all three had logged the same pattern, independently: humid weather → left-knee ache by afternoon. Not the same knee. Not the same age of onset. But the same pattern.
We had expected matches; we had not expected the degree of overlap. What surprised us was the grandmother's pattern was strongest on the right.
(We don't know what this means. We don't think anyone else does either. But it is noted, in Ada's archive, for her daughter.)