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Our immune systems constantly fight off disease — protecting us from colds, flu and infection. An experimental treatment called immunotherapy is helping patients' immune systems fight off cancer.

A commission advising Pope Francis on how to tackle clerical sex abuse of minors has completed its first full meeting at the Vatican. The commission has been criticized for its slow start.

The class divide is widened by gaps in counseling kids for college.

Samsung warned its customers that their TVs are sending reports to third parties and that could include sensitive information spoken by the owners. The policy has drawn comparisons to Orwell's 1984.

Robert Siegel speaks with Brice de le Vingne, director of operations dealing with the Ebola outbreak for Doctors without Borders.

With the Ukraine crisis spiraling, President Obama and Germany's leader Angela Merkel met in Washington, D.C.