NASA NASA’s Curiosity rover finds calcium deposits on Mars similar to those seen on Earth when water circulates in cracks and rock fractures.
Bulgaria In Bulgaria, an assailant identified as Oktai Enimehmedov attempts to assassinate opposition leader Ahmed Dogan at a party congress of the Movement for Rights and Freedoms.
January 2013 Great Britain and Ireland snowfall Four climbers are killed by an avalanche in Glen Coe in the Scottish Highlands while descending the south side of Bidean nam Bian. A fifth member of the party is airlifted to hospital with serious injuries, while a sixth escapes unharmed.
Another 100 flights are cancelled at Europe's busiest airport, Heathrow, with some passengers forced to spend the night sleeping on the terminal floor.
Algerian army The Algerian army stages a final assault on a gas facility near the town of In Aménas, where militants took an unknown number of foreign workers hostage on January 16. Totally at least 23 hostages and 32 terrorists were killed for the four days of crisis.
Syrian civil war The children death toll of the Syrian civil war reaches 3,538, with over 60,000 people killed overall.