States are preparing for, while trying to avoid, cutbacks to the water they get from the Colorado River. Here are some key things to know about this moment.

Sleeper sharks live extraordinarily long lives and can thrive in near-freezing ocean temperatures near Earth's poles.

Antarctica’s Hektoria Glacier stunned scientists by retreating eight kilometers in just two months, with nearly half of it collapsing in record time. The rapid breakup was driven by a flat, underwater bedrock surface that allowed the glacier to suddenly float and fracture from below. Satellite and seismic data captured the dramatic chain reaction in near real time. The findings raise concerns that much larger glaciers could one day collapse just as quickly.

Researchers have been studying tens of thousands of proteins and even more variations without a yardstick to compare their results.

A lost cache of 250-million-year-old fossils from Australia has rewritten part of the story of life after Earth’s worst mass extinction. Instead of a single marine amphibian species, researchers uncovered evidence of a surprisingly diverse community of early ocean predators. One of these creatures had relatives stretching from the Arctic to Madagascar, showing that some of the first sea-going tetrapods spread across the globe with remarkable speed.

The DANcast welcomes Allison Vitsky Sallmon, an accomplished underwater photographer and the founder and president of Dive Into the Pink.

Since becoming certified in the early 1990s, Allison has immersed herself in the diving world, including cold-water diving and underwater photography. Her stories and images have been widely published, and in 2021, she was inducted into the Women Divers Hall of Fame. As a breast cancer survivor, she founded Dive Into the Pink, a nonprofit that engages the dive community to raise funds for cancer research and survivor support.

Allison is a longtime Alert Diver contributor; read her recent article Photography for Philanthropy at dan.org/alert-diver/article/photography-for-philanthropy. Learn more about Dive Into the Pink at diveintothepink.org.