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Close-up of tzoallis being made during a summer nutrition workshop held by Puente a la Salud, a group based in Oaxaca, Mexico, that is helping to push an amaranth comeback. An ancient Aztec staple, tzoallis are made of amaranth and corn flour, agave honey and amaranth cereal.

Why Mexican Chefs, Farmers And Activists Are Reviving The Ancient Grain Amaranth

The nutritious indigenous plant is part of a movement to revive native crops and cuisines — and a means of restoring the health and economy of Oaxaca, one of Mexico's poorest states.

The Gwozdziec synagogue roof structure installed in the POLIN Museum of the History of Polish Jews in "Raise The Roof."

JEWISH FILM SHOWCASE: Raise The Roof

Airs Tuesday, Dec. 12, 2017 at 9 p.m. on KPBS TV

The Valley that is home for the Salton Sea sits below sea level. It has been flooded and dried multiple times on a geological historical scale. The current lake was born of a construction accident that pierced an irrigation canal in 1905. The damage was not repaired for 18 months allowing the low-lying area to flood.

A Look At The Incredible Shrinking Salton Sea

California’s largest lake, the Imperial Valley’s Salton Sea, is poised to begin shrinking at unprecedented speed this year. Look at these photos that show you how the lake is changing.

Poet Reg E. Gaines On Being 'The Last Celebrity'

Poet, author and playwright Reg E. Gaines will perform an excerpt from his latest work, "The Last Celebrity" this Saturday at Voz Alta Project in Barrio Logan.

Border wall prototypes on display in San Diego, where contractors offer different designs.

Trump's Planned Visit To San Diego Draws Supporters, Protesters and Tight Security

Security preparations are underway for President Donald Trump's expected visit to San Diego on Tuesday, when he will inspect eight prototypes for his proposed border wall.

Remembering Roberta Flack: The Virtuoso

Roberta Flack is only solo artist to win two consecutive Record of the Year Grammys and she helped usher in an enduring style of R&B. Could she be pop music's most under-appreciated influence?

Students wearing headscarves and helmets learn to navigate traffic cones in a scene from the Oscar-winning documentary, "Learning to Skateboard in a Warzone (If You're a Girl)."

An Oscar Goes To A Documentary About Skateboarding Girls In Afghanistan

The short documentary is called Learning to Skateboard in a Warzone (If You're A Girl. "This movie is my love letter to the brave girls of that country," says director Carol Dysinger.

Farming is a major economic driver in the Imperial Valley and it will continue to provide water for the Salton Sea. However, the amount of water flushed off farm fields is not nearly enough to keep the current lake level stable.

Study: Toxic Elements Around Salton Sea Could Adversely Affect Nearby Residents

The problem has to do with selenium-rich fertilizers in the wetland areas surrounding the Salton Sea.

Developer Aaron Million, who is proposing to divert 55,000 acre-feet of water from the Green River in Utah to Colorado's Front Range, is pictured in this undated photo.

Is There Water Left To Be Developed In The Colorado River Basin?

The Colorado River is running low on water. The lifeline that slakes the thirst of 40 million southwestern residents is projected to hit a historic low mark within two years, forcing mandatory cuts to water deliveries in Arizona, Nevada and Mexico.

The researchers used the Mars Reconnaissance Orbiter to make observations about ice on Mars.

Thick, 'Rather Clean' Ice Sheets Are Spotted On Mars

The size and accessibility of these ice sheets, as well as the fact that they're made of relatively clean water, could be an important resource for astronauts traveling to Mars.

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