A new computational model suggests that Uranus' and Neptune's cores may be less icy than their "ice giant" nickname suggests.

The oldest sediment DNA discovered so far comes from Greenland and is 2 million years old.

As the Arctic melts and people spend more time there, defining our relationship to sea ice becomes more necessary.

“Even when ice looks thick, it can vary by inches within a few feet,” Park explained. “Cold-water immersion is extremely ...