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Russian President Vladimir Putin congratulated US President-elect Donald Trump, rather than President Barack Obama, in his annual New Year's greetings statement to foreign heads of state and government.

A Vermont electric company, Burlington Electric, said it found malicious software that US authorities believe was used by Russian hackers in the US election on one of their company laptops. CNN's Polo Sandoval reports.

Ronda Rousey was knocked out by Amanda Nunes 48 seconds into the fight.

Syria's latest ceasefire is a fragile one, could this be the one that holds? Lt. Col. RickFrancona weighs in.

In an interview with CNN's Kate Bolduan, Rep. Lee Zeldin says that Putin has outsmarted President Obama with his reaction to Obama's sanction.

A planet named Proxima b has been discovered orbiting the closest star to our sun. It may be the closest possible home for life outside of the solar system.

Japan joined the exclusive stealth jet club with the successful test flight of its first radar-evading aircraft -- a prototype called the X-2.

President-elect Donald Trump is getting a taste of what it's like to go up against Senator John McCain -- particularly on issues like Russia and Trump's relationship with Vladimir Putin. CNN's Manu Raju reports.

We're entering the Earth's sixth era of extinction -- and it's the first time humans are to blame. CNN introduces you to the species that are already going.

NASA Administrator Charles Bolden, legendary astronaut Buzz Aldrin, and leading physicist Kip Thorne on whether or not we can go to another planet.

Jan Chamberlin, a member of the Mormon Tabernacle Choir, sent a resignation letter to the group saying she will not sing for Donald Trump. CNN's Jean Casarez reports.

CNN's Nick Glass takes a look at some of the famous actors, musicians and athletes that died in 2016.

Scientists with NOAA found an unknown species of octopod on the ocean floor while mapping uncharted waters off the coast of Hawaii.

The Pentagon has awarded a contract to Aurora Flight Sciences Corporation to build a vertical takeoff concept aircraft called LightningStrike.

CNN Chief Political Correspondent Dana Bash counts down the top ten moments that defined the 2016 political season.

In an exclusive interview with CNN's Brian Stelter, the parents of Austin Tice, an American journalist who went missing in Syria in 2012, say they're encouraged by reports that their son is still alive and urged the US government to keep working to bring him home.

CNN's Jim Sciutto talks to CNN Senior Legal Analyst Jeffrey Toobin about the Connecticut Supreme Court reinstating the 2002 murder conviction of Michael Skakel. Skakel, a Kennedy relative, was found guilty in the 1975 death of Martha Moxley, his childhood neighbor.

A Texas mother died and her two daughters were injured when they fell from a chairlift at a Colorado ski resort, authorities said.

In a year-end tradition, Chief White House photographer Pete Souza selects the best photos of President Barack Obama from 2016.

U.S. Air Force Colonel Avery Kay is considered the father of the A-10 Thunderbolt, also known as the Warthog. He was laid to rest at Arlington National Cemetery on March 11, 2016.