Arthur becomes hurricane, threatens July 4 celebrations

Arthur has become the first named Atlantic hurricane of the 2014 season.

Europe got a fabulous display of noctilucent clouds on July 3

This has been a wonderful year for seeing these electric-blue clouds that shine at night.

Healthy honey bees discovered in Newfoundland

Scientists say the Newfoundland populations of bees offer them a unique opportunity to investigate honey bee health.

Amazing purple jelly in the deep sea

Many deep-sea creatures are red, but this one is a strange purple-blue. Oceanographers wonder what benefit there is to being purple under miles of ocean.

5.2-magnitude earthquake shakes Arizona and New Mexico

The moderately strong and shallow earthquake had its epicenter near Lordsburg, New Mexico, near the Arizona and New Mexico state line.

When can you expect your warmest summer day?

A new map shows the warmest days of the year on average throughout the United States

Thunderstorms spawn elusive sprites

Sometimes called red sprites or lightning sprites, they are offshoots of large-scale electrical discharges that take place above thunderstorms.

Will El Niño develop later this year?

There is a 70% chance that El Niño will develop in the equatorial Pacific Ocean later this summer.

Lifeform of the week: Leafcutter ants

Humans aren't the only species that farms, they're not even the first.