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Most tests for viruses aim to detect only one or two. But researchers can now check a drop of blood for antibodies to hundreds of viruses, tracing the history of a lifetime of infections, old and new.

Preliminary findings show that almost half of a section of pipeline that ruptured last month near Santa Barbara was worn away.

The report says there are few incidents of tainted water given the number of wells. Energy companies agree. Environmentalists accuse the industry of undue influence over the study.

It’s coming down to the wire for the Export-Import Bank, the federal agency that offers financing and loan guarantees to help U.S. businesses export…

In a fast-changing health crisis, South Korea's government is holding back key data amid calls for more openness. That's only adding to growing doubt that leaders can handle the situation.

It's been called the "Greece of the Caribbean." Puerto Rico is more than $72 billion in debt. But because it's not a state, it can't use bankruptcy protection to help it restructure its debt.