For our #TBT we found for you this great photo of a glowing tree mold, in the shape of a heart no doubt, from the October 1968 eruption of Kilauea volcano in Hawaii Volcanoes National Park. This photo was taken west of Napau Crater. Credit: D.A. Swanson, Oct 12, 1968. Learn more about the Kilauea volcano at hvo.wr.usgs.gov/kilauea/