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Hells Canyon is the deepest river canyon in the United States. Now scientists have solved the mystery of when it formed.

In recent years, Catholic bishops have spent millions on campaigns to defeat abortion rights measures at the ballot box. This year, they're taking a dramatically different approach.

A massive explosion and fire rocked a port in southern Iran possibly linked to a shipment of a chemical ingredient used to make missile propellant.

The Federal Reserve cut interest rates by a quarter percentage point. How much further rates fall could depend on how President-elect Trump approaches his second term.

It's not easy to bring such cases. That's because the federal government is generally immune from being sued, except in certain circumstances set out by Congress.