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Shavings of metal can flake off of the artificial joints and cause serious pain and medical problems in the hip. About a half-million Americans have this type of implant, and though most patients won't have a problem, one doctor called the failure rate "unacceptably high."

Sarah Palin is backing the House speaker's GOP primary challenger after Ryan declined to endorse Donald Trump. But primary upsets remain rare and hard to orchestrate.

Iowa and New Hampshire have spoken, each in its own unique accent. Now the race moves on to Nevada and South Carolina, states quite different from the first two, and quite different from each other.

The TV and film star is the first parent to be sentenced in connection with the years-long, multimillion-dollar scheme. The case has resurfaced questions about college access, race and privilege.

Russians face a confusing patchwork of online restrictions as the Kremlin cracks down on the free flow of information on social media.

Pennsylvania's Sen. Rick Santorum has long been considered to be the Senate's most endangered Republican. But polls show him closing the gap with Democratic candidate Bob Casey Jr. Political onlookers are wondering whether the turnabout is a case of Santorum gaining -- or Casey faltering.

Barry Bonds ties Babe Ruth for second place on the career home run list with number 714. He homered into the first deck of elevated stands in right-center leading off the second inning against the Oakland Athletics.

Sarah Clements was 16 when she began pushing for stricter gun laws after the 2012 school shooting in Newtown, Conn. Since the recent mass shootings, she says the work is more dire and more difficult.

Russia's attack on Ukraine has put a focus on the North Atlantic alliance. Here's what you need to know about NATO.

Missiles targeted a military training facility near the Polish border.