Highlights 4/26 to May 2

Nature at 7 p.m. Sunday looks at the plummeting numbers of horseshoe crab and how their decline could affect other species – including humans.

Masterpiece Classic at 8 p.m. Sunday presents part five of “Little Dorrit” as trouble continues in London, but Mr. Dorrit and Amy remain in Italy.

Journey the buffets in Las Vegas, going behind the food to the tireless chefs and servers, and finally the farmers who buy leftovers in bulk to feed their pigs in Buffet at 9:30 p.m. Sunday.

Follow internationally acclaimed chef Todd English as he travels to Peru in search of culinary inspiration through native ingredients and cuisines in Food Trip with Todd English at 10 p.m. Sunday.

American Experience We Shall Remain at 8 p.m. Monday tells the story of the Cherokee, who, although forced form their land, established a republic with a legislature and legal system in attempts to keep some of their ancestral lands.

Appalachia: A History of Mountains and People at 9:30 p.m. Monday relates how land grabbers poisoned a region that was once renowned for its restful spas and noble character.

Wine Roads of Texas at 10:30 p.m. Monday visits vineyards in the busy metroplex of Dallas and Fortworth, as well as Grapefest, the biggest wine festival in the region, in Grapevine, Texas.

Nova at 7 p.m. Tuesday travels to Indonesia to investigate the debate over the “Hobbit” bones found on the island of Flores in 2007.

Frontline at 8 p.m. Tuesday examines what happens when mentally ill offenders leave prison, only to return at alarming rates.

Linguists at 9 p.m. Tuesday follows scientists David Harrison and Gregory Anderson as they race to document languages on the verge of extinction.

Director Michal Goldman traces the history of “The Coops,” a cooperative apartment complex built in the Bronx by Jewish garment workers in the 1920s in Independent Lens at 10 p.m. Tuesday.

Secrets of the Dead at 7 p.m. Wednesday investigates the story of the ship named Lady Juliana, a transport for 200 female thieves, prostitutes and con artists that turned into a floating brothel.

Featuring first-person stories from adolescents confronting depression, anxiety and mental illness, Cry for Help at 8 p.m. Wednesday provides a rare and important look at mental illness among young adults.

Sixty years after covering the aftermath of World War II, Walter Cronkite traces the complex and changing relationship between the United States and England and explores the dramatic shifts of the Cold War from the end of the war to present, in Legacy of War at 9 p.m. Wednesday.

The Raconteurs bring their blues-power guitar with a touch of psychedelia, followed by soulstress Cat Power in Austin City Limits at 10 p.m. Wednesday and 11 p.m. Friday.

Photographer Mary Ellen Mark discusses her career documenting cultures from around the world and across the United States on Texas Monthly Talks at 7 p.m. Thursday.

The fight over medical marijuana and state versus federal law has raged for over a decade. Docubloggers at 7:30 p.m. Thursday shares the opinions of politicians, Willie Nelson, and folks like you.

Downtown at 8 p.m. Thursday visits the refugee center Caritas of Austin, the new Blanton Museum of Art on the UT campus and the firefighters of Fire Station #1.

In Context at 8:30 p.m. looks at the creative vision of several local and international artists.

Staten Island native and singer/songwriter Ingrid Michaelson performs at the Cape Cinema in Cape Cod in Live from the Artists Den at 9 p.m. Thursday.

Back in form after a near-death battle with Hepatitis C, Alejandro Escovedo performs songs from his hit album “The Boxing Mirror” in Austin City Limits at 7 p.m. Saturday.