Scientists in South Africa have been stunned to discover that termite mounds that are still inhabited in an arid region of the country are more than 30,000 years old, meaning they are the oldest known active termite hills. Some of the mounds near the Buffels River in Namaqualand were estimated by radiocarbon dating to be 34,000 years old, according to the researchers from Stellenbosch University. “We knew they were old, but not that old,” said Michele Francis, senior lecturer in the university’s department of soil science who led the study. Her paper was published in May. Francis said the mounds...