5 things to know for January 31: Cold, Russia probe, Foxconn, immigration, Fed rates
(CNN) -- Step inside the cave in Siberia that sheltered the first known humans 300,000 years ago. Here's what else you need to know to Get Up to Speed and Out the Door. (You can also get "5 Things You Need to Know Today" delivered to your inbox daily. Sign up here.)
1. Cold wave
The Midwest is still stuck in a deep freeze. The temperature is well below zero in many states, thanks to a breakdown in the polar vortex that's flooding the region with the coldest air it's seen in years. ...