Magnitude-7.1 earthquake in Alaska

There were no reports of injuries, but the powerful earthquake left a fair amount of cleanup to do, plus some frightened people in Alaska.

2015 hottest year on record, by far

"What we have seen this past year will likely be routine in about 15 years, although regionally the details will vary considerably," says climate expert Kevin Trenberth.

How to take photos of snowflakes

Try it yourself! With a little preparation and a good camera and with a macro lens, you can take your own photos of snowflakes.

View from space: Mississippi River flooding

Two satellite images show the contrast between the flooded Mississippi River this month and the same area last year. Check out the difference!

Extreme weather lowers global crop yield

Researchers found that extreme heat and drought between 1964 and 2007 account for about a 10% decline in global cereal crop production.

Lifeform of the week: Puffer fish

Killer sushi, stoned dolphins, and zombies; the puffer fish is an animal steeped in scandal.

2015 worst US wildfire year on record

Wildfires burned more than 10 million acres of land in the United States in 2015, a year marked by intense drought across much of the west.

What to expect from El Niño

The third-recorded super El Niño is underway. Top climate expert Kevin Trenberth reports.

Gorgeous timelapse of California skies

Southern California night skies ... looking from inside massive sea caves and across miles of inland desert. Wonder Endlessly timelapse by Jack Fusco.

Four new elements added to periodic table

The new elements - elements 113, 115, 117 and 118 - complete the periodic table's seventh row and make science textbooks around the world instantly out-of-date.