Millions under extreme heat threat across the U.S.

Millions of people in the United States are at risk for dangerous or extreme heat on Friday, July 25, 2025, and through the weekend.

A mysterious fossil and the evolution of skin and feathers

A fossil of an ancient reptile shows a distinct crest that is made neither of feathers, scales or hair. It's forcing scientists to rethink reptilian evolution.

Can sharks smile? It’s Shark Week! Enjoy these shark videos

Can sharks smile? Not likely. But dogs, monkeys and dolphins all show expressions akin to human smiles. Learn more about sharks during Shark Week.

Meet the dragon blood tree. Can this species bleed?

The dragon blood tree is a wonder on the outside and the inside. It has a red sap that solidifies when exposed to oxygen and looks like blood!

Grand Canyon landslide due to Meteor Crater impact?

Two world-famous Arizona attractions – the Grand Canyon and Meteor Crater Natural Landmark – might share a hidden connection.

Tropical disturbance to impact Gulf Coast this week

A tropical disturbance will bring wind and rain to the Gulf Coast states this week. It has the potential to strengthen into Tropical Storm Dexter.

Celebrate Arctic Sea Ice Day with belugas, bears and more

Arctic Sea Ice Day is today, July 15, 2025. And you can participate! Snap pics from a Beluga Boat with attached live cams and classify the whale bits you see.

Teenage Greenland sharks’ hangout spot revealed in new study

Scientists have discovered a high number of juvenile Greenland sharks in Skagerrak, a body of water between Denmark, Norway and Sweden.

Chimpanzees wear blades of grass in their ears and rears

Some chimpanzees in captivity imitated each other with the seemingly useless activity of putting a blade of grass in their ears and rears.

Earth will spin unusually quickly in July and August

The shortest days on Earth for 2025 will be in July and August. But why is Earth spinning faster? It's a bit of a mystery. Get the dates here.