Dr. Joan Feynman died in July 2020. Her brother, Richard, was of course much, much more famous, with a Nobel Prize and a wealth of stories to his credit. But his little sister, a world acclaimed expert on auroras and the magnetosphere, wasn't exactly a slouch. This is to Heather Dale and Ben Deschamps' Joan of Arc song "Joan."
Another from 2008. My take on the concept of the most recent common ancestor (MRCA), and specifically on "Y-Chromosome Adam," the counterpart to "Mitochondrial Eve."