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The San Vicente reservoir in San Diego County stores water from as far away as the Colorado River. Pumping water into a smaller reservoir in the surrounding mountains could store excess solar power until it's needed, when the sun sets.

'Water batteries' in California could store solar and wind power for when it's needed

San Diego has an ambitious plan to store renewable energy, using extra solar power to pump water up a mountain. This old-style "water battery" technology could be set for a revival.

A work brigade sponsored by Venezuelan state-run oil company PDVSA, which critics blame for the oil spills, use shovels and rakes to remove congealed petroleum from a Lake Maracaibo beach.

Oil spills increase in Venezuela as it revs up output after the U.S. lifted sanctions

After the U.S. lifted its sanctions, Venezuela is trying to revive its beleaguered oil industry. But ramping up production is causing more oil spills.

A tech billionaire is quietly buying up land in Hawaii. No one knows why

A mystery has been brewing in a small ranching town on Hawaii's Big Island. Word has it that Salesforce CEO Marc Benioff bought the land, stirring worries about what he plans to do with it.

Lost French love letters from the 1750s reveal what life was like during wartime

A University of Cambridge historian has decoded more than 100 previously unopened letters sent during the Seven Years War.

<em></em><strong>Invertebrates Winner:</strong> <em>The big buzz</em>. South Texas, USA. The world's bees are under threat from habitat loss, pesticides and climate change. With 70% of bee species nesting underground, it is increasingly important that areas of natural soil are left undisturbed.

See the buzzworthy winners of the Wildlife Photographer of the Year competition

This year's top prizes went to a teen from Thailand and an American who is just the fifth woman to win in 58 years. Karine Aigner spoke with NPR about the significance of the photo and the award.

How we ended up answering our mail through a video screen

The history of email.

Children activating the installation <em>America's Playground: DC</em> by artist Derrick Adams in Constitution Gardens on the National Mall.

A groundbreaking exhibition on the National Mall shows monuments aren't set in stone

The first official outdoor exhibition on Washington D.C.'s National Mall showcases six artists whose monuments honor American stories missing from the heart of the country's capital.

An archeologist holds an arrow originally believed to be from the Iron Age on Mount Lauvhøe in Norway. Upon closer inspection, the team determined the artifact is from the Stone Age and is likely around 4,000 years old.

Archaeologists in Norway found an arrow that was likely trapped in ice for 4,000 years

The arrow was found at a site on Mount Lauvhøe that was previously covered in ice. The new discovery adds new "time depth" to the research site.

An International Energy Agency report says countries are setting records building solar power projects like this one in Mona, Utah in 2022.

A new climate change report offers something unique: hope

Electric vehicles and solar power are growing quickly and offering hope the world could still meet climate change goals.

A car passes by the Town of Atherton city limits sign July 12, 2005, in Atherton, Calif.

A car was found buried at a California estate once owned by a man convicted of murder

Police are investigating after landscapers discovered a car contained unused bags of concrete buried in the yard of a 1.63-acre estate in the San Francisco Bay Area.

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