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Edith is enthusiastic about her wedding and hopes to convince her family that Strallan's age does not matter. With Downton's finances dire because of Robert's actions, Mary takes matters into her hands -- but the personal price may be high.

The years 1969-1970 take Americans to the moon and back; what happens to scientific and engineering programs after national goals are achieved.

The roots of basketball pros Brittney Griner and Chris Paul.

Sign off.

Manuel, who lives in the Sonoran Desert, tells Chris he has seen an ocelot, a wild cat that usually lives in the rainforest.

Carl thinks his potato display is the best idea to show his school spirit; Nico tries to join the Junior Nutty Buddy Nut Lovers' Club.

Daniel learns to ask before hugging Margaret; Jodi learns that it is important to ask first before touching someone else.

Phoebe and Jay learn how to sort items; Phoebe and Jay learn how to make food labels, so everyone can participate in the potluck.

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

The wombats battle sea monsters, surfing scoundrels and pointy rocks on their way to make a sandwich delivery; Mr. E. buys a robot to hand out balloons.

Panda is sad when an exciting holiday is over; Rockstar Penguin asks Donkey and Panda to make up a new dance.

Rosie wants Javi's popcorn for family movie night, so she tries to find the perfect trade; Rosie makes a seashell museum at the beach.

Ari grows impatient waiting for ketchup; Elinor, Olive and Ari have to figure out how to expand their clubhouse to fit all the new members of The Explorer's Club.

Alma helps Howard find a drum when he joins the neighborhood drum circle; Alma and Junior try to earn toy tickets.

Molly teaches tourists how to fish responsibly; Molly helps Randall hide his long hair.

David Suzuki explains to Xavier that by taking care of the earth, we take care of ourselves; Esther Martinez explains to Xavier and Yadina about how stories can connect people to their family histories.

Beatrice Ojakangas prepares Danish pastry pockets, Danish braid, Norwegian potato crêpe, potato lefse and Swedish oatmeal hardtack.

The new addition foundations are poured and backfilled; installing a beam to support the new opening from the dining room to the kitchen; the interior designer helps with decisions; Tommy and Kevin discuss the new apprentices.

The five remaining cooks swap recipes and prepare each other's dishes; the cooks must come up with an original fusion dish that represents their own unique American story.

Topps uncut card sheets from 1973; a ring collection circa 1970; a 1967 Ram Kumar oil painting.

George Patton's gold World War I trench watch; a 1949 Charles Loloma pot; a 1944 Joseph Erlanger's Nobel Prize and diploma.

A Mexican charro saddle; Gaston Chaissac artwork; 1956 Olympics USA Basketball memorabilia.

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

Idaho state gems and gold nuggets circa 1905; 1935 Gum Inc. Mickey Mouse cards; 1826 portraits attributed to the Guilford County Limner.

A 1980 Topps basketball cards box; Marvel The Amazing Spider-Man comics; an Alexej von Jawlensky Meditation oil.

Geoffrey Baer meets dancers, musicians, architects and writers in Havana and experiences the color, culture and history of the city.

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