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The electors in the electoral college cast their vote today to official elect Donald Trump as president. CNN's Sara Murray reports.

Pete Vowels walks through his unusual role inside shipping company UPS.

Former CIA Director James Woolsey tells CNN's Jake Tapper it's difficult to combat terrorists using trucks because the attacks require "no weapons," "nothing you have to smuggle," and "no special skill."

CNN's Clarissa Ward reports on how Moscow officials are reacting to the assassination of Russian Ambassador Andrei Karlov.

CNN's Barbara Starr reports the latest details in the horrifying assassination of a Russian envoy, what the Russian government calls a terrorist attack.

German officials say at least nine people are dead after a truck plowed into a crowd of people gathered at a holiday market in Berlin. CNN's Frederik Pleitgen reports.

Intelligence officials have been concerned about growing terror threats across Europe. CNN's Max Foster reports.

In 1991, Zsa Zsa Gabor talked to CNN's Larry King about her autobiography in which she dishes on her love life and the infamous traffic stop with Los Angeles police.

CNN's Fred Pleitgen is on the ground in Berlin where a truck plowed through a busy Christmas market, killing at least nine people and wounding dozens.

New Year's Eve Live with Anderson Cooper and Kathy Griffin. Coverage starts 12/31 at 8PM ET

Russia's ambassador to Turkey, Andrey Karlov, was shot at an art exhibition in Ankara, Turkey's official Anadolu news agency reported.

President-elect Donald Trump continues to cast doubt that Russia hacked emails in order to influence the 2016 presidential election. But just two years ago, Trump said Russian hacking was a 'big problem.'

Police are now investigating the deadly Christmas market crash in Berlin as an act of terrorism. CNN's Paul Cruickshank reports.

German officials say dozens are injured and at least nine people are dead after a truck drove through a Christmas market in Berlin. CNN's Fred Pleitgen reports.

Dubai is aiming to become a leading smart city by 2021. The city in the United Arab Emirates is crowd sourcing for innovation by having startups from around the world work directly with government entities.

During a 1997 interview, Florence Henderson talks to CNN's Larry King about her life growing up and how she got the role of Carol Brady in "The Brady Bunch."

Hang Son Doong in Vietnam is the largest known cave in the world. Photographer Ryan Deboodt took a drone inside to capture this spectacular footage.

Raging wars, political turmoil, and socio-economic uncertainty. These challenges, coupled with low oil prices, have made 2016 a year to forget for many countries in the region. Will 2017 be any better?

CNN'S Zain Verjee speaks with Muhammad Lila as he translates what the shooter of the Russian ambassador to Turkey shouted after the attack.

"Hidden Figures" stars Taraji P. Henson, Octavia Spencer, and Janelle Monáe tell CNN's Frank Pallotta why the movie is an important but often untold piece of history.