Latvia officially adopts the euro as its currency and becomes the 18th member of the Eurozone.
The Ebola virus epidemic in West Africa begins
Malaysia Airlines Flight 370, a Boeing 777 airliner, disappears over the Gulf of Thailand with 239 people on board. The aircraft is presumed to have crashed into the Indian Ocean.
The Rosetta spacecraft's Philae probe successfully lands on Comet 67P, the first time in history that a spacecraft has landed on such an object.
U.S. President Barack Obama announces the resumption of normal relations between the U.S. and Cuba.