Highlights May 1 to 7

Nature at 7 p.m. Sunday investigates the parallel stories of collapsing Pacific salmon populations and how biologists and engineers have become instruments in audacious experiments to replicate every stage of the fish’s life cycle in “Salmon: Running The Gauntlet”.

Masterpiece Classic at 8 p.m. Sunday presents part one of South Riding, the story of a lively heroine in Depression-era Yorkshire who attempts to shake up education at a school for girls.

Irena Sendler tells her story of the daring conspiracy of women in WWII Communist Poland who risked their lives in the name of Warsaw’s Jewish mothers in “Irena Sendler: In The Name of Their Mothers” at 9 p.m. Sunday.

Roads to Memphis: American Experience at 8 p.m. Monday tells the wildly disparate yet fatefully entwined stories of an assassin, James Earl Ray, and his target, Dr. Martin Luther King, Jr., against the backdrop of the seething and turbulent forces in American society that led these two men to their violent and tragic collision in Memphis, Tennessee.

Emerging artists take the spotlight as part of Austin Museum of Art’s exhibition “New Art In Austin: 15 to Watch” on Arts In Context at 9:30 p.m. Monday.

On Black In Latin America at 7 p.m. Tuesday, Professor Gates arrives in Brazil and delves behind the facade of Carnival to discover how this ‘rainbow nation’ is waking up to its legacy as the world’s largest slave economy.

Independent Lens at 9 p.m. Tuesday presents “A Film Unfinished”, a documentary examining a classic Nazi propaganda film used by historians for decades to provide insight into the realities of life in the Warsaw Ghetto in 1942.

Secrets of the Dead: China’s Terracotta Warriors at 7 p.m. Wednesday investigates extraordinary story behind China’s 8,000 terracotta warriors guarding the First Emperor of China’s extravagant tomb.

Nova at 8 p.m. Wednesday joins a new generation of archeologists as they probe areas of Machu Picchu that haven’t been touched since the time of the Incas and unearth burials of the people who built the sacred site.

Saving The Bay at 9 p.m. Wednesday explores the Great Earthquake and Fire of 1906, the rise of California’s water re-distribution projects and the Bay’s transformation into the world’s greatest shipbuilding center by the close of World War II.

Austin rocker Alejandro Escovedo delivers tracks from his most recent LP Street Songs of Love on Austin City Limits at 10 p.m. Wednesday and 9 p.m. Friday, followed by Trombone Shorty’s unique fusion of New Orleans-based jazz and funk rock.

Actress Holland Taylor discusses her career on Overheard with Evan Smith at 7 p.m. Thursday and 8:30 p.m. Friday.

Directed by Academy Award-winning filmmaker Paul Wagner, “Thoroughbred” captures the beauty of the horse breed, the thrilling nature of the horse racing and the history and tradition worldwide at 7:30 p.m. Thursday.

Take a tour of hands-on Master Gardeners who created gardens, one weekend at a time on Central Texas Gardener at noon Saturday.

Hip hop conquers the Austin City Limits stage at 7 p.m. Saturday with sets from alternative rapper/actor Mos Def, supporting his latest record, The Ecstatic, and Somalian native K’naan, performing songs from his acclaimed LP, Troubadour.