Dark blue: It's going to take a foot or more of snow to close schools. Green: Any snow's going to shut things down. reddit.com/user/atrubetskoy hide caption

itoggle caption reddit.com/user/atrubetskoy

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

itoggle caption Markus Hell/Tareom.com/AP

Contractors, volunteers and members of the Georgia National Guard helped move this car on Thursday. It was one of more than 2,000 vehicles abandoned Tuesday when a wicked winter storm left roads covered in ice. Brant Sanderlin /MCT/Landov hide caption

itoggle caption Brant Sanderlin /MCT/Landov

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

itoggle caption Aaron Harris /Reuters/Landov

Satya Nadella, who's reportedly in line to be Microsoft's next CEO. Stephen Brashear/AP hide caption

itoggle caption Stephen Brashear/AP

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

itoggle caption Alex Urosevic/Reuters/Landov

FedEx employees sorted through mounds of packages in December at one of the company's facilities in Miami. Consumer spending helped fuel the economy in the third quarter. Gross domestic product grew at a 3.2 percent annual rate (a figure that adjusts for holiday spending to show the "real" growth). Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Staff Sgt. Anthony Orsi, left, and Staff Sgt. Raymond Novak of the Army National Guard helped Lauren Gates (in vehicle) retrieve her car Thursday from the Cumberland Boulevard exit ramp along I-75 North in Atlanta. Guard members and police were working to reunite drivers with more than 2,000 cars. Daniel Shirey/Getty Images hide caption

itoggle caption Daniel Shirey/Getty Images

Northwestern quarterback Kain Colter, who finished his college career last season, is the spokesman for the players' effort to unionize. John Mersits /CSM/Landov hide caption

itoggle caption John Mersits /CSM/Landov