Britain has left the European Union, becoming the first member state in the bloc’s history to do so. Source

A top White House aide said President Trump is “gratified” the trial is moving toward a conclusion, and said that a Wednesday vote will not interfere with the president’s Tuesday night State of the Union address. CBS News White House reporter Kathryn Watson joins CBSN with analysis. Source

Iowa is filled with young parents struggling to find affordable child care. The state has one of the lowest unemployment rates, but leads the nation in families where both parents work outside the home. Nikole Killion has more. Source

The Senate is set to hold the final vote on the two articles of impeachment on Wednesday. Source

On January 7, 2007, a fire destroyed the Stermer house, killing 42-year old father and husband, Todd Stermer. “48 Hours” follows the case of Linda Stermer, Todd’s wife, who was arrested and convicted for arson and murder Source

The federal government has declared a public health emergency and is taking a historic step to contain the coronavirus. For the first time in decades, U.S. citizens returning from China are being quarantined. Carter Evans has the latest. Source

Businessman Pete Kadens grew up in Toledo and wanted to give back. So he surprised high school students and their parents with the gift of a lifetime. Steve Hartman has their story on the road. Source

Patients swallow a trace amount of peanut protein and gradually scale up. Source

History is being made in Great Britain. It’s divorce from the European Union became official nearly four years after the Brexit vote. Source

The FDA has approved the first treatment to treat peanut allergies, which can be deadly. Kids swallow peanut powder, at first in tiny, then in increasingly larger doses. Source