Allied troops began the attack on Paris during World War II.
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One billion people logged into Facebook for the first time, surpassing a major milestone.
Pavel Durov, founder of the encrypted messaging app Telegram, was arrested in France for alleged involvement in organized crime.
American explorer Victor Vescovo became the first person to journey to the deepest points of every ocean.
Astronomers announced the discovery of an Earth-like planet named Proxima b.
Nurse William Pooley, who was treating patients in Sierra Leone, flew to London for emergency treatment after contracting Ebola.
