Scientists have unearthed peculiar million-year-old rock tunnels in Africa, which have left researchers puzzled and suggest the existence of an ancient lifeform that has never been identified before.

Researchers have found a "unique" collection of "cave pearls"—some of which contain archaeological artifacts—in an ancient tunnel, a study has reported. Cave pearls are a type of "speleothem"—a term ...

Microscopic tunnels hidden inside desert rock are forcing scientists to rethink how ancient life spread across Earth. These ...