Odds of exceeding maximum contaminant levels were significantly greater for water systems in the Southwest and serving Hispanic communities. A new national study of public water systems found that arsenic levels were not uniform across the U.S., even after implementation of the latest national regulatory standard. In the first study […]

Here on Earth, geologists seek out deep channels into Earth’s rock, carved over the ages by flowing water. The exposed rock walls are like a visual timeline of a region’s geological history. On Mars, the surface water is long gone. But it flowed long enough to expose layers of rock […]

Illustration showing a multilayer conceptual model of the transport mechanism of fresh groundwater from onshore to offshore in Hawai‘i. Credit: University of Hawai’i   ENLARGE Twice as much freshwater is stored offshore of Hawai’i Island than was previously thought, according to a University of Hawai’i study with important implications for volcanic […]

Mars suffered an early bombardment before settling in to a prolonged calm, a new meteorite record indicates. DETLEV VAN RAVENSWAAY/SCIENCE SOURCE It was a tough fundraising pitch: Martin Bizzarro, a cosmochemist at the University of Copenhagen, needed some $500,000 to buy—and then grind up—material from one of the oldest and […]

This artist’s concept depicts the early Martian environment (right) – believed to contain liquid water and a thicker atmosphere – versus the cold, dry environment seen at Mars today (left). Credit: NASA’s Goddard Space Flight Center water escapes Mars — not like a leaky faucet but with a sudden splash. Mars once […]

A temple rises above the rainforest at the ancient Maya city of Tikal. Credit: David Lentz Maya imported zeolite and quartz to filter drinking water. Clean drinking water helped Tikal flourish, University of Cincinnati archaeologists say. Ancient Maya in the once-bustling city of Tikal built sophisticated water filters using natural […]

The Maya city of Tikal has famous temples—and also the world’s earliest zeolite-based water filtration system. KENDALLRITTENOUR/ISTOCK.COM The Maya city of Tikal is famous for its soaring palaces and temples. But something far more humble kept Tikal functioning: its water filtration system, the earliest known of its kind. Researchers recently […]

Martian meteorite NWA 7533 is worth more than its weight in gold. Credit: © NASA/Luc Labenne A meteorite that originated on Mars billions of years ago reveals details of ancient impact events on the red planet. Certain minerals from the Martian crust in the meteorite are oxidized, suggesting the presence […]