Andrew Ng and Daphne Koller, Stanford University computer science professors who started Coursera, pose for a photo at the Coursera office in Mountain View, Calif., on Aug. 2, 2012. Jeff Chiu/AP hide caption
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Years ago, the boulder in the foreground broke loose and rolled on to this farm in northern Italy. Then this month, the boulder in the center of the photo tumbled down the mountain, tore through a barn and came to rest in a field. Fortunately, no one was hurt. Markus Hell/Tareom.com/AP hide caption
A tasseled wobbegong shark (top) lies on the seafloor with the head of a brown-banded bamboo shark in its mouth on the fringing reef of Great Keppel Island on Australia's Great Barrier Reef in August 2011. Reuters/Landov hide caption
Travelers at Pearson International Airport in Toronto earlier this month. At an unnamed airport, Canada's spy agency tested a program that allowed them to track those who took advantage of free Wi-Fi. Aaron Harris/Reuters/Landov hide caption
Investigative officers look inside a container carrying a Russian-made MIG-21 fighter jet aboard the Chong Chon Gang, in the port city of Colon, Panama, in July. Arnulfo Franco/AP hide caption
U.N. mediator Lakhdar Brahimi during his news conference Friday in Geneva. Martial Trezzini/EPA/Landov hide caption
Fireworks explode in a Shanghai street on Thursday, the eve of the Lunar New Year. Setting off firecrackers is meant to ward off evil spirits and bring good luck. But many Chinese say they won't buy firecrackers this year, owing to growing worries about air quality. Peter Parks/AFP/Getty Images hide caption
Ying Compestine's green tea-steamed shrimp dumplings. Lucy Schaeffer/Houghton Mifflin Harcourt hide caption
Thursday
Shoppers check out vodka in a street kiosk in Moscow in 2008. Alexander Nemenov/Getty Images hide caption
The complete demolition of the Masha' al-Arb'een neighborhood in the Syrian city of Hama. The group Human Rights Watch says the Syrian government army destroyed at least seven neighborhoods since the middle of 2012 because they were opposition strongholds. DigitalGlobe hide caption
Scarlett Johansson recently became SodaStream's spokeswoman and appeared at an event at the Gramercy Park Hotel on Jan. 10 in New York City. The actress soon found herself engulfed in controversy because of her affiliation with a company that has a factory in a Jewish settlement in the West Bank. Mike Coppola/Mike Coppola/Getty Images for SodaStream hide caption
There was quite a commotion Wednesday night in Toronto when pop star Justin Bieber (center) arrived at a police station to be charged in connection with the alleged assault on a limo driver. Alex Urosevic/Reuters/Landov hide caption
Michael Schumacher in April 2012. Eugene Hoshiko/AP hide caption