From NPR News

Throughout history, atrocities have been committed in the name of medical research.

Nazi doctors experimented on concentration camp prisoners. American doctors let poor black men with syphilis go untreated in the Tuskegee study. The list goes on.

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"The reality is this outbreak's not over," says Dr. William Fischer, speaking about Ebola. "It's just changed."

Fischer, a professor at the University of North Carolina who's been studying Ebola survivors, was speaking about the new cases in Liberia. On Monday, a 15-year-old died of the disease. The teenager's father and brother have also tested positive for Ebola. Health authorities have not yet determined how the family was infected.

An explosion ripped through a bus carrying presidential security in central Tunis on Tuesday, prompting the Tunisian president to issue a state of emergency for the North African country.

NPR's Leila Fadel reports that a spokesman for Tunisia's Interior Ministry said at least 11 people were killed in the attack and 17 others were wounded. The state of emergency will last for 30 days and an overnight curfew is also in place until tomorrow morning local time.