Lapatilla
Visitors observe the falls in Niagara Falls, Ontario, January 8, 2014. The frigid air and “polar vortex” that affected about 240 million people in the United States and southern Canada will depart during the second half of this week, and a far-reaching January thaw will begin, according to AccuWeather.com. REUTERS/Aaron Harris (CANADA – Tags: ENVIRONMENT TRAVEL)