Paleontology

55-Million-Year-Old Predatory Mammal Footprint Found in Antarctica

Track-bearing slab T-373 from King George Island, Antarctica. Sclae bar - 10 mm. Image credit: Mansilla-Vera et al., doi: 10.1007/s00300-026-03539-1.

A single fossilized footprint found in volcanic mud on a remote Antarctic island is the first known trackway from a mammal in Antarctica, and the earliest evidence anywhere on the continent of a carnivorous mammal. Track-bearing slab T-373 from King George Island, Antarctica. Sclae bar – 10 mm. Image credit: Mansilla-Vera et al., doi: 10.1007/s00300-026-03539-1. The new specimen, a partial...

Biology

Tasmanian Tiger’s Skull Reveals Hunting Style with No Modern Match

A pair of thylacines, a male and female, c. 1905. Image credit: Smithsonian Institutional Archives / E. J. Keller, National Zoological Park.

For nearly a century, scientists have treated the thylacine (Thylacinus cynocephalus) as a textbook case of convergent evolution — a marsupial that independently evolved to look and hunt like a gray wolf (Canis lupus) despite being separated from placental carnivores by 160 million years of evolution. In a new paper published in the journal Nature Communications, researchers from Flinders University,...

Medicine

Keto Diet Outperforms Others for Cardiometabolic Health during Weight Loss: Study

Diet macronutrient content affects the cardiometabolic benefits of weight loss. Image credit: Petersen et al., doi: 10.1016/j.cmet.2026.07.020.

Not all diets are created equal when it comes to reversing the metabolic damage of obesity, even when they produce the same amount of weight loss, according to a new randomized clinical trial published in the journal Cell Metabolism. Diet macronutrient content affects the cardiometabolic benefits of weight loss. Image credit: Petersen et al., doi: 10.1016/j.cmet.2026.07.020. “Obesity causes a constellation...

Geology

Australia’s North Pole Dome Crater is Earth’s Oldest and Only Known Archean Impact Structure

The North Pole Dome crater: (A) simplified map of the East Pilbara Terrane (EPT, Western Australia), showing Paleoarchean granite domes (pink) and greenstone belts (greens and blues); the North Pole Dome (NPD) lies near the terrane center; (B) geological map of the NPD and the shatter-cone field (yellow star); (C) A quartz (Qtz)-carbonate vein cutting shatter-cone lineation. Image credit: Kirkland et al., doi: 10.1130/G54866.1.

Zircon crystals and impact-altered minerals show that a massive asteroid slammed into what is now the Pilbara region of Western Australia about 3 billion years ago. The North Pole Dome crater: (A) simplified map of the East Pilbara Terrane (EPT, Western Australia), showing Paleoarchean granite domes (pink) and greenstone belts (greens and blues); the North Pole Dome (NPD) lies near the terrane center;...