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Aerial view of water making its way into the parched Colorado River delta.

Colorado River Delta 'Pulse Flow' Shows Signs of Success

Water release at Yuma dam enhances vegetation, opens waterway to Sea of Cortez for first time in half-century.

Artist's rendering of the Giant Magellan Telescope.

UA Gets $20M to Help Build World's Largest Telescope

Scottsdale businessman's donation will help pay for 8 mirrors for instrument to be installed in Chilean mountains.

Shawnee Riplog-Peterson, curator of mammology and ornithology at the Arizona-Sonora Desert Museum, discusses the multi-state, binational breeding program involving bighorn sheep.

Plans to Use Helicopters in Wilderness Areas Worries Conservationists

Arizona Game and Fish wants the aircraft to manage bighorn sheep.

Will This Be the Hottest Year Ever in Tucson?

Meteorologists expect 2014 to be the warmest on record.

NASA Spacecraft Gets Closer to Pluto; Should It Be Reclassified as a Planet?

New Horizons is turning its cameras on after a 9-year, 30-billion mile journey from Earth.

Repose - The Potent Pause

Tucson residents' new book recommends lying on your back for a surprising number of mental and physical health benefits.

Experts: Fewer Trees May Result in Healthier Forests

Scientists say this could increase water supplies for people, help environment in Northern Arizona.

Voices for the Cure with Carolyn Green and LaTrice Jordan

Hear how family support and regular self-checks and mammograms helped a Tucson woman to survive breast cancer - twice.

Voices for the Cure with Sherrie Dobson

The story of a woman who listened to her body - and her mother - and caught her breast cancer early, now looks back at her experience in a way she never thought she would.

Voices for the Cure with Claudia Arévalo

A cancer survivor, lawyer and new mom talks with her brother about the hard times ten years ago when she was first diagnosed with breast cancer.

Kim Puete and Jennifer Wigle

Voices for the Cure with Kim Puete and Jennifer Wigle

Listen to two of the countless women whose lives have been touched by breast cancer share their story of courage, love, hope.

New Solar Wind Project Moving Ahead in San Luis

Tower to produce electricity will be first of its kind using gravity, water vapor, hot desert air.

Edward Beshore, Deputy Principal Investigator for OSIRIS REx Mission, discusses the dangers Earth faces from space objects.

Public Can Submit Messages for OSIRIS-REx Digital Time Capsule

Submissions will be placed on microchip aboard spacecraft to fly to asteroid, back.

New Projector at Flandrau Planetarium Enhances Views of Space

New system takes viewers on soaring journeys through solar system, galaxy, stars, asteroids in 3D.

Mountain lion in the mountains west of Tucson.

Project Hopes to Photograph Jaguars, Ocelots Near Tucson

Camera traps set up at more than 200 places in mountains surrounding the city.

Teenagers Ask Big Questions at Biosphere 2's Summer Academy

It's a Tuesday afternoon, a group of high school kids are trudging in rubber boots through only mangrove forest in Southern AZ.

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