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The pontiff said he would travel to Philadelphia for the World Meeting of Families. Francis would be the fourth pope to visit the United States.

Also: DEA agents conduct surprise inspections of some NFL teams; a growing number of children are homeless in the U.S.; and the Leonid meteor shower peaks tonight.

Merck's Vytorin reduced the risk of heart attack and stroke more than a cholesterol-lowering statin alone. The findings come from an international study of more than 18,000 people in 39 countries.

The parts, including an infant's head, a baby's foot and an adult heart, were allegedly stolen from a medical museum. The Americans said they bought the parts at a Bangkok market, according to police.

In a statement, Paula and Ed Kassig remembered their 26-year-old son, Peter Kassig, also known as Abdul-Rahman Kassig, as both a realist and an idealist. Kassig was killed by the Islamic State group.

Modafinil has been approved for treatment of narcolepsy, but it's often used to improve mental performance. The question is, does it work? A new study says probably not.

We chat about the return of the terrific if little-seen Lisa Kudrow show The Comeback, which has resurfaced on HBO for a new season after almost 10 years.

A Kurdish businessman decided he'd like to live in the White House. So he is building a 32,000-square-foot version of the U.S. presidential residence in Irbil, near the raging war against ISIS.

Our series continues with a school administrator who fuses his talent for rapping with his passion for education.

Amid a raging debate about study replication, commentator Tania Lombrozo says it isn't just a few contested findings at stake, but the future of the field.