Scientists have solved the mystery of how earthquakes can occur 420 miles deep inside Earth, where extreme pressure and heat ...

The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for decades. Now, Harvard researchers think they have a good explanation for ...

For those who do not qualify for a Social Security number, there are still options for opening a U.S. credit card without an SSN. Here are the top card options available from issuers not requiring ...