Mitt Romney handily wins the Florida primary; as the U.S. experiences one of the milder winters in recent memory, Eastern Europe freezes; and Facebook prepares to rock the market with its IPO. This and more in this week's Week in Pictures.
In this April 12, 2005 file photo, the world headquarters of Pfizer Inc. is seen in New York. Pfizer Inc. is recalling 1 million packets of birth control pills due to a packaging error that could raise the risk of an accidental pregnancy by leaving women with an inadequate dose, Wednesday, Feb. 1, 2012. (AP Photo/Mark Lennihan, File)
An Orthodox Christian cathedral in winter landscape in Kiev, Ukraine, Monday, Jan. 30, 2012. Ukraine's Emergency Situations Ministry said 18 people died of hypothermia and nearly 500 people sought medical help for frostbites and hypothermia in just three days last week. Heavy snow and a severe cold snap have killed at least 36 people across eastern Europe and many areas were under emergency measures Monday as schools closed down, roads became impassible and power supplies were cut off. (AP Photo/Efrem Lukatsky)
This Jan. 12, 2012 photo, shows the exterior view of Facebook's new headquarters in Menlo Park, Calif. Facebook, the social network that changed "friend" from a noun to a verb, is expected to file as early as Wednesday to sell stock on the open market. Its debut is likely to be the most talked-about initial public offering since Google in 2004. (AP Photo/Paul Sakuma)
United States Secretary of State Hillary Rodham Clinton, right. winks at British Foreign Secretary William Hague after he addressed a Security Council meeting on the situation in Syria, Tuesday, Jan. 31, 2012 at United Nations headquarters. Syrian troops crushed pockets of rebel soldiers Tuesday on the outskirts of Damascus and the U.N. Security Council took up a draft resolution demanding that President Bashar Assad halt the violence and yield power. Clinton told the Security Council that action to end the violence in Syria would be different from U.N. efforts to pacify Libya. (AP Photo/Mary Altaffer)
Egyptian fans clash with riot police following Al-Ahly club soccer match against Al-Masry club at the soccer stadium in Port Said, Egypt Wednesday, Feb. 1, 2012. Some dozens of Egyptian soccer fans were killed Wednesday in violence following a soccer match in Port Said, when fans flooded the field seconds after a match against a rival team was over, Egypt's Health ministry said. (AP Photo)
People work on the floor of the New York Stock Exchange, Wednesday, Feb. 1, 2012. The European Union on Wednesday blocked the Deutsche Boerse's planned merger with NYSE Euronext, a $10 billion deal that would have created the world's largest financial exchange operator. (AP Photo/Richard Drew)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney visits his campaign office in Tampa, Fla., Tuesday, Jan. 31, 2012, during Florida's primary election day. Romney handily defeated Newt Gingrich, his main threat in the primary. (AP Photo/Charles Dharapak)
