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Neurosurgeon Ben Carson is a darling of conservatives. It started when he criticized President Obama's health care law and other policies at a Prayer Breakfast with the president just a few feet away.

Gen. Joseph Dunford Jr. has had a rapid rise. In about three years, he went from a one-star general to a four-star general. He is currently the commandant of the Marine Corps.

Infections with C. difficile are a big problem for people in hospitals and nursing homes. An experimental treatment with spores from a harmless version of the bacterium prevented new infections.

Between 1886 and 1919, Andrew Carnegie planted nearly 1,700 libraries across America. Over the years they grew. Now they are trying to survive.

Loretta Lynch also met with police, local officials, members of Congress and community groups.

Fresh fighting around Najran comes after a nearly six-week Saudi-led air campaign against Houthi rebels. Aid agencies urge a halt to bombing Yemen's airports so humanitarian supplies can be delivered.