With four days to go until Monday’s Iowa caucuses, Buttigieg is ramping up his rhetoric and taking direct shots at two of his top rivals for the Democratic nomination. Source

Carol Leonnig, co-author of the new book “A Very Stable Genius,” joins CBSN to discuss new details about an exchange between President Trump and top military officials at a July 2017 Pentagon meeting. Source

One of the highest-profile women corporate leaders in America is stepping down after eight years at the helm. Source

“What we saw in the cave was amazing because just from the shape of the jaw we’ll be able to find out more about how this species lived,” the paleontologist said. Source

Life expectancy for Americans increased a bit in the latest CDC data, reversing a downward trend. The first gain in four years is due in part to a decline in cancer deaths. CBSN’s Anne-Marie Green and Vladimir Duthiers have details. Source

White House defense lawyer Alan Dershowitz said a presidential quid pro quo to help reelection is not an impeachable offense. Ilya Shapiro, director of the Robert A. Levy Center for Constitutional Studies at the CATO Institute, joins CBSN to talk about the legal standing of Dershowitz’s argument and what would happen if senators’ vote on calling witnesses results in a tie. Source

A newly-installed portion of the U.S.-Mexico border wall in Calexico, California tipped over in high winds yesterday and came to rest on some trees on the Mexican side. CBSN’s Anne-Marie Green has the story. Source

104-year-old Marine Corps veteran Bill White is a Purple Heart recipient and this year, he’s looking for more hearts – in the form of valentines. He started “Operation Valentine” out of his senior living home and California, and ended up receiving thousands of gifts and cards from around the world. Source

Derek Johnson bought a duck when it was just a one-day-old chick – and that tiny duckling has grown into a superstar. Johnson said he didn’t want his duck to be a boring pet, so he named him Ben Afquack, taught him how to drum and made him internet famous. Source

There are disturbing new accusations against R. Kelly from his ex-girlfriend Azriel Clary. Last March, Clary and another of Kelly’s girlfriends, Joycelyn Savage, defended the singer in a “CBS This Morning” interview with Gayle King. But now, in an exclusive interview with The Sun, Clary says she “lied on Gayle” during that interview. She says she was “brainwashed” by Kelly and said Kelly has hundreds of victims across the U.S. who will not come forward. Kelly is in jail awaiting trial on sex crime charges. Source