Program Highlights

On July 4, 2012, scientists at the giant atom smashing facility at CERN announced the discovery of a subatomic particle that seems like a tantalizingly close match to the elusive Higgs Boson. Now CERN’s scientists are preparing to restart the collider at higher energy, hoping to find the next great discovery that will change what we know about our universe.

IQ: SMARTPARENT equips parents and caregivers with the knowledge and tools they need to successfully guide their children in the use of digital media and technology. Airing back-to-back, the first three episodes address children's media consumption – from helping them discern between fiction and reality to safeguarding their online identities.

In this episode, the hasty arrangements for Susan and Teddy's wedding are threatened, but Ronald Merrick provides a solution. The Layton family gathers in Mirat as guests of its ruler, the Nawab, who may even attend the wedding. However, what should be a happy occasion is overshadowed by unexplained incidents. Part 3 of 14.

All is fair in love and war. This week, "Downton Abbey" brings new beginnings and welcome ends: Lord Merton delivers a bombshell to Isobel, and Mary does likewise to Tony; Police suspicions deepen in an unexplained death; and Robert and Sarah lock horns. Pictured: Richard E. Grant as Simon Bricker and Elizabeth McGovern as Cora, Countess of Grantham.

Austin highlights include a spinning wheel (pictured) gifted to the owner's mother by Mahatma Gandhi; a pin designed by pop artist Roy Lichtenstein that features his trademark Ben-Day dot pattern; and a diamond and platinum Van Cleef and Arpels necklace that was custom ordered for $5,700 by the owner's father-in-law and is now worth $125,000.

Escaping the ravages of nature and man, champion trees are the largest of their species in any state. With lives spanning hundreds of years,  these silent sentinels have watched history unfold around them. CHAMPION TREES explores these natural wonders and how they influence and inspire the people around them.

In this series based on the international best-selling mysteries by Norwegian author Unni Lindell, Reidar Sørensen stars as Cato Isaksen, an Oslo homicide detective who juggles a complicated home life with police work. In the series premiere, Isaksen takes the case of a man found murdered in his Oslo apartment. In Norwegian with English subtitles.

FRONTLINE investigates how the NRA uses its unrivaled political power to stop gun regulation in America. With first-hand accounts of school killings in Newtown and Columbine, and the shooting of Congresswoman Gabby Giffords, “Gunned Down” examines why, despite the national trauma over gun violence, Washington hasn’t acted.

The GLOBE TREKKER hosts explore some of the world's great natural wonders. Their destinations include erupting volcanoes in Hawaii and Java, the Perito Moreno glacier in Patagonia, the Arctic, the Amazon rainforest, the Sahara Desert, Australia's Great Barrier Reef, Victoria Falls and more. Pictured: Iguazu Falls, Argentina.

NOVA follows the epic operation to secure, raise and salvage the Costa Concordia cruise ship, which ran aground and capsized off the coast of Italy on January 13, 2012, killing 32 people. The wreck stretches the length of three football fields, weighs 45,000 tons and lies half submerged on the site of a protected reef, with a 160-foot-long hole in its hull.

This program offers a behind-the-scenes look at the filming of LEGENDS OF FLIGHT, the acclaimed IMAX film that puts viewers in the cockpit of some of history's most amazing aircraft (including a Stearman wooden biplane, Harrier Jump Jet, and Super Constellation) that influenced the radical new design of Boeing's 787 Dreamliner (pictured) and the Airbus 380.