In 1991, a skateboarder discovered 1.5-million-year-old giant ground sloth fossils in Wilmington, North Carolina. Scientists from the Smithsonian determined the fossils belonged to two different ...

In a discovery that challenges long-standing views of prehistoric life, scientists have uncovered vast underground tunnels beneath Brazil and Argentina that appear to have been excavated by ...

Huge ancient underground tunnels have been discovered in Brazil and Argentina, and the source of these huge structures is not believed to be due to humans or natural geological processes. Reaching ...