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Facebook CEO to face new questions, this time from European lawmakers

Mark Zuckerberg is expected to offer an apology in a meeting that will be live-streamed

Congo vaccinates health workers against Ebola

Vaccine use starts new era of fighting deadly virus

Public support for vaccines drops

Strong support for vaccines has fallen since 2008, survey finds

Manhunt in Baltimore area after female officer killed

'What exactly happened, we are not sure yet until an autopsy is performed.'

What is 'laze'? Toxic gas plume created by Hawaii volcano

Lava haze is made of dense white clouds of steam, toxic gas and tiny shards of volcanic glass.