KETZ-DT

Elmo and friends have until the end of the day to set the record for the tallest cookie tower ever.

Luke plays doctor with Stu as a nurse and Lyla pretends to be different patients; Lyla, Everett, Luke and Stu build an elaborate track to get a tennis ball down to the lobby.

While looking at shapes in nature, the Wild Kratts discover a sphere shaped "rock" that turns out to be a 3-banded armadillo; Zach challenges everyone to a bowling match.

A group of Ayn Rand-inscribed books; Edward Borein watercolor circa 1930; a 1931 Carnegie hero medal; a visit to Crab Tree Farm.

A team of forensic experts excavate a giant Pliosaur skull, the largest Jurassic predator ever known.

A unique site in southern England preserved rare traces of ancient ice age mammoths and Neanderthals; host David Attenborough.

Hunters and fisherman enjoy the great outdoors in Arkansas.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

Co-anchors Amna Nawaz and Geoff Bennett and correspondents offer in-depth analysis of current events.

Arkansan Adam Riley and Canadian Matty Clarke face harsh environments as they attempt to cross the Northwest Passage, a 2,200-mile sea route over the top of Canada, aboard handmade rowboats.

When a gang leader is found dead outside a boxing tent, Phryne investigates.

Mervin and the team have quite the mystery on their hands when a game show contestant is stabbed during filming of the grand finale; in a baffling turn of events, the victim is murdered midair while hurtling down a zip line.

Twenty-four hours a day, the latest national and international stories as they break.

Christiane Amanpour leads discussions about world issues and interviews with global leaders.

Self-assembling machines, light-up bacteria and a physical demonstration of evolution revolutionize volunteers' views of life.

Three ordinary people search for humanity's true place in the cosmos.

The chance discovery of a jade artifact leads to the unearthing of an ancient city hidden in the mountains of Sichuan.

A team of forensic experts excavate a giant Pliosaur skull, the largest Jurassic predator ever known.

A unique site in southern England preserved rare traces of ancient ice age mammoths and Neanderthals; host David Attenborough.

Uniting mind and body with the standing rotation, revolved open twist, and the apex pose, Twisted Sister.

Keeping the glutes toned and strong can relieve back pain and prevent injury; working on feet and hip alignment; moving in ways to increase range of motion.

The team searches for an injured endangered Florida panther spotted off Alligator Alley highway.

Rae needs to think differently when showing an injured Beeple how to use a wheelchair; Dev helps predict the weather.

Lyla struggles to sleep and tries to figure out what is wrong with her sleep routine; Lyla tries to do her own hairstyle.

Carl's favorite sour pickle scratch-n-sniff sticker loses its smell; Carl notices that his baby blanket, Knit-Knit, has a hole in it.

Daniel is frustrated when Juan Carlos doesn't pretend the same way he does; Chrissie gets upset when O plays horse differently than she does.

Phoebe and Jay are asked to bird sit; photo time leads Jay to an outfit disaster.

Tamir is disappointed when Grandma Nell shows off the drawing he made for Chris before it is finished.

Daniel is frustrated when Juan Carlos doesn't pretend the same way he does; Chrissie gets upset when O plays horse differently than she does.

Duck enjoys "me time" at the beach; the pals like different things at Donkey's sleepover.

Rosie, Iggy and Crystal make a movie; Mom finds a photo from the day they got Gatita.

Noisy birds keep Elinor's dad awake; Elinor loses her voice just before she and her friends are supposed to sing for the class.

A dirty Chacho runs away at the park; Alma realizes that Frankie's old sneakers are more valuable than they appear.

Tamir is disappointed when Grandma Nell shows off the drawing he made for Chris before it is finished.

Lyla struggles to sleep and tries to figure out what is wrong with her sleep routine; Lyla tries to do her own hairstyle.

A Civil War Union soldier archive; Disneyland railroad hat badges circa 1957; an art deco diamond, sapphire and pearl necklace circa 1925.

A unique site in southern England preserved rare traces of ancient ice age mammoths and Neanderthals; host David Attenborough.

The chance discovery of a jade artifact leads to the unearthing of an ancient city hidden in the mountains of Sichuan.

Arkansan Adam Riley and Canadian Matty Clarke face harsh environments as they attempt to cross the Northwest Passage, a 2,200-mile sea route over the top of Canada, aboard handmade rowboats.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

Co-anchors Amna Nawaz and Geoff Bennett and correspondents offer in-depth analysis of current events.

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital.

Twenty-four hours a day, the latest national and international stories as they break.

Christiane Amanpour leads discussions about world issues and interviews with global leaders.

Smooth reflections appear to be exact replicas of the mountains above.