Final answer:
Lucy, a 3.2-million-year-old fossil discovered by Donald Johanson, was named after the Beatles song "Lucy in the Sky with Diamonds" because it was playing in the camp at the time of her discovery.
Step-by-step explanation:
Donald Johanson, an American paleoanthropologist, named the 3.2 million-year-old skeleton Lucy after the popular Beatles song, "Lucy in the Sky with Diamonds". This historic fossil discovery took place in 1974 in the Afar region of Ethiopia, and Lucy's species was identified as Australopithecus afarensis. Due to the cultural atmosphere of the time and the celebration that ensued following the find, the song that was famously playing in the camp influenced the decision to name the ancient ancestor Lucy.