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Inside the escalating military struggle to control space and satellites; how the satellites we rely on are vulnerable to attack, how debris is filling crowded orbits and what can be done to protect them.

A French explorer makes an unprecedented discovery in Alexandria's harbor that could reveal new information about Cleopatra's reign and her connection with the goddess Isis.

Sign off.

Dylan realizes he doesn't love square-dancing; Carl teaches Nico how to ride a bike.

Daniel gets upset when Margaret spills juice on his stuffed animal Tigey; Daniel has a hard day at school.

Mr. More's bubble bath goes wrong when his super strong bubbles start trapping everyone; characters come out of a book and wreck the library; a Letter Fog causes chaos.

Phoebe, Jay, Grandma Annie and Pete create the family's first recipe for Sunday greens; Phoebe and Jay are excited about their first campout in the courtyard.

Elmo's bike is great, but Abby's bike might be even better; Tamir teaches Elmo how to deal with feeling jealous and to enjoy the things Elmo already has.

The wombats invent a color game; Super invents a Piggyback rider.

Donkey and Panda search for Mooing Moon Moths; Bob Dog can't remember where he buried his boogie bone.

Rosie, Jun and Grandpa Liu go to the Asian Market to buy more sweet potato buns; Rosie and Javi help Tia overcome her stage fright when she goes on a television cooking show.

The kids learn the meaning of stories when they visit Olive's family in the rainforest.

Alma and Howard search for a Black cowboy in the Bronx; Alma and Junior open a play hair salon at home.

Molly learns how to make offerings, hoping to stop a volcano from erupting.

Charlotte Akoto prepares meringue cookies, cocoa nests with caramel mousse and a tropical napoleon.

The importance of prep work; whitewashing an outdoor bench; how double pane glass is made; repairing a broken window.

Rachita makes a shocking discovery which has a huge impact on both her investigation and her personal life.

How dogs have been reshaped by evolution to become the perfect partner to humans.

Exploring the science and unexpected histories of "The Replacements," five animal and plant species that made allies of humans.

Louisa May Alcott "Little Women" books from 1869; Samuel Prince desk and bookcase made around 1775; a child's swan sled circa 1880.

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

Kevin, Zack and homeowner Ethan tackle demolition of the kitchen.

Heath upgrades pull-chain lights; patching a lawn with sod; best of "What Is It?" moments.

Ana and Alberto's relationship suffers a setback when Raúl de la Riva discovers their romance; Raúl's takes measures that could endanger his own collection.

Kevin, Zack and homeowner Ethan tackle demolition of the kitchen.

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