New research suggests a plasma bubble in the high atmosphere blocked radio communications during a 2002 firefight in Afghanistan, which lead to a deadly US helicopter ambush.
The United States and its Arab allies early Tuesday launched bombing raids against Islamic State militants in Syria, opening up a new front in the battle against the jihadist group after more than a month of US air strikes in Iraq.
The aim of the strikes is to stop jihadists from moving into autonomous Kurdistan and carrying out a potential genocide against displaced minorities.
World leaders on Monday commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global.
A specially outfitted marine vessel will destroy the most dangerous chemicals at sea.
From sports and space, to trade and missiles, frosty U.S.-Russia relations are back.
Inventions and technologies that changed our world entered the stage during the first world war.
A 20th century without Hitler, the Internet or President Obama.
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