Scientists are tracing ancient helium trapped beneath South Africa’s gold fields, revealing how rare gas survives for ...

In a quiet corner of an ancient riverbed on Mars, a speckled rock has pushed the search for extraterrestrial life into its ...

When highly pathogenic bird flu turns up in dairy cattle, you feel it in the pit of your stomach, not just at the farm gate but at the grocery cooler. Federal and state officials say that is exactly ...