Police chief resigns as protests mount from people wanting answers as to the fate of 43 missing college students.
Father and sister of US photojournalist Luke Somers being held captive by al-Qaeda appeal for his safe return.
Unmanned mission seen as major step towards deep space exploration that could put people on Mars one day.
Thousands march against grand jury's decision not to charge white NY police officer for the death of Eric Garner.
Appeals court rules against advocate's attempt to extend "legal personhood" and associated rights to chimpanzees.
Physicist turned weapons expert enjoys support among Republicans who will take control of Senate next month.
Maria Corina Machado, who backed anti-government protests this year, charged over alleged plot to kill president Maduro.
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