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Melissa Block speaks with U.S. ambassador to Liberia Deborah Malac about the U.S. effort to combat Ebola in West Africa. Work has been slowed by difficult conditions and a shortage of trained workers.

Flooding from extreme tidal swings was once just a rare nuisance for coastal cities. But rising sea levels have increased the frequency of these nuisance floods as much as tenfold since the 1960s.

Apple says its new operating system for the iPhone features encryption so secure that not even Apple has the key to it. But the FBI warns that the software could limit its ability to fight crime.

Meanwhile, authorities said they still have not been able to identify 28 bodies found in clandestine graves.

This year's Nobel Prize in chemistry went to a team that came up with a way to take a closer look at the secret lives of living cells. It could make biomedical research a lot easier.

The key demand of the recent protesters in Hong Kong has been democracy. But behind that desire is anger about jobs, high housing prices, and competition — and a culture clash — with mainland Chinese.

He likely contracted the virus when he carried an ailing pregnant woman into her home. Relatives and neighbors in Liberia miss his jovial spirit — and lash out at their government and the U.S.

The Swedish Academy lauded Modiano "for the art of memory with which he has evoked the most ungraspable human destinies and uncovered the life-world of the occupation."

The Grand Challenge is a new tradition in the world of public health: asking anyone (and everyone) to come up with innovations. The latest assignment: design cooler protective gear for Ebola teams.

The Chinese territory's chief secretary, Carrie Lam, says a call from pro-democracy forces to step up protests if concessions aren't made has undermined the dialogue.