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Guest George Clooney.

Using an anonymous letter and geographical profiling, investigators close in on a serial rapist, and a cleverly obtained DNA sample confirms their suspicions.

When a young boy has serious respiratory problems and his father shows signs of early Alzheimer's disease, a chance encounter with a stranger kicks off an investigation into the cause.

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Paid programming.

Stay informed with the latest breaking news and headlines.

Early morning news and entertainment program that covers important issues with key figures from around the world and a wide spectrum of topics, including medicine, finance, consumer issues, computer technology, education and gardening.

Stay informed with the latest breaking news and headlines.

Straight No Chaser performs; journalist Hilary Sheinbaum; Deals and Steals with Tory Johnson; reporter Will Ganss.

The Miccosukee Tribe of Indians of Florida showcase traditional fishing practices; Florida's endangered coral reefs.

Jack and Suzi find the smallest elephants in the world on a river cruise through Borneo; meeting two adult tapirs in Peru; hippos and rhinos on safari in South Africa.

The Red Raiders and Cougars make their debuts in the Big 12 title game. Both teams are 11-1. Texas Tech beat BYU 29-7 in November. The Raiders held the Cougars to 67 rushing yards in that contest, well below their 194.5 season average.

All the latest news and analysis from the world of college football.

The Crimson Tide (10-2) and Bulldogs (11-1) meet in the SEC championship game for the third time in five years. Alabama is 4-0 against Georgia in SEC title contests. The Bulldogs yielded a total of 22 points in the last three outings.

All the latest news and analysis from the world of college football.

The Cavaliers (10-2) and Blue Devils (7-5) compete for the ACC championship. Virginia defeated Duke 34-17 in November. Cavaliers senior J'Mari Taylor has rushed for 14 touchdowns. Blue Devils sophomore Darian Mensah boasts 28 touchdown passes.

Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.

Dolly Parton on recording 'Rockstar' with legendary musicians. Plus the game 'Country Marketplace' and a performance from Jackson Dean.

Emergency response providers put their lives at risk to save others.

Emergency response providers put their lives at risk to save others.

After a life-altering incident, John Nolan decides to pursue his dream of becoming a police officer; as the force's oldest rookie, John is met with skepticism from some higher-ups.

Hosts Mario Lopez, Kit Hoover, Scott Evans and Zuri Hall take viewers behind the velvet ropes and onto the red carpet to deliver celebrity interviews and entertainment news stories in Hollywood.

Afters a storm rolls through a small town in Maine, a beloved teenager is found brutally murdered.

When a part of Alta, Norway slides into the sea, a little canine manages to survive it all; winter weather brings a Wisconsin highway to standstill; a dust devil sends a field full of tents into the sky at a German music festival.

A Christian ministry works to take the Gospel to the entire world.

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Paid programming.

Charles Stanley, pastor of the First Baptist Church in Atlanta, shares his insights on Christian faith and enlightens viewers with spiritual motivation.

Early morning news and entertainment program that covers important issues with key figures from around the world and a wide spectrum of topics, including medicine, finance, consumer issues, computer technology, education and gardening.

Anchor George Stephanopoulos and co-anchors Martha Raddatz and Jonathan Karl interview top newsmakers and officials, with reporting from across the country and roundtable debates over the hottest political issues.

Whether supplements give student athletes a competitive edge.

A snowmobiler relies on friends and family to save his life after being caught in a terrifying mountain avalanche; an tribute to heroes of episodes past.

Animal species that know how to beat the heat.

Jeff learns how people and bears coexist in Alaska; how the people of Alaska are managing the salmon across the state.

From Feather Sound Country Club in Clearwater, Fla.

WalkFit® Platinum - A Customizable Orthotic to Relieve Your Body Pain at an Unbeatable Price. Over 25 million people have improved the quality of their lives!

In a classic game-show version of "Hangman," contestants solve word puzzles for cash and prizes.

Delivering the news that matters most.

Stay informed with the latest breaking news and headlines.

Kids react to unwanted gifts; pets create Christmas tree chaos; families fumble through festive fun; nine of the season's top winners face off for the $100,000 prize.

The funniest clips from the previous 35 years; kids on the naughty list; Christmas klutzes; those hilariously fed up with the festivities.

Divorced dad Scott (Tim Allen) has custody of his son (Eric Lloyd) on Christmas Eve. After he accidentally kills a man in a Santa suit, they are magically transported to the North Pole, where an elf explains that Scott must take Santa's place before the next Christmas arrives. Scott thinks he's dreaming, but over the next several months he gains weight and grows an inexplicably white beard. Maybe

Stay informed with the latest breaking news and headlines.

Sheldon is upset when he realizes Leonard is the center of their group of friends.

Dolly Parton on recording 'Rockstar' with legendary musicians. Plus the game 'Country Marketplace' and a performance from Jackson Dean.