Billionaire tech mogul Elon Musk drew attention to a circa 1960 converted underground limestone mine in Pennsylvania his team ...

The federal government still processes retirement applications manually in a Pennsylvania limestone mine, a system Elon Musk ...

Elon Musk took aim at a limestone mine in Pennsylvania, where they said federal employee retirements are processed using an outdated system.

Five households in the immediate vicinity of a massive, ever-widening sinkhole near Tokyo were urged to evacuate Sunday, with ...

Japanese rescuers completed building a slope on Saturday to reach a truck driver stuck in a sinkhole, officials said, four ...