
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Prehistoric humans in Brazil carved drawings in the rock next to dinosaur footprints, suggesting that they may have found them meaningful or interesting, a new study has found. The rock carvings, which archaeologists call petroglyphs, are at a site called Serrote do Letreiro in Paraíba, an agricultural state on the eastern tip of Brazil. Researchers first observed the marks in 1975. But they are now interpreted as relating to the...