It's only happened twice since naming started in 1950, and there's an unusual twist to where many of the storms are forming this year.

In an unusual twist, many of those storms have been forming closer to the US coast.

Laura went from a tropical storm to a major hurricane in less than 24 hours, sending coastal residents scrambling to prepare. Hurricanes Harvey and Michael exploded in strength in similar ways.

Laura went from a tropical storm to a major hurricane in less than 24 hours, sending coastal residents scrambling to prepare. Hurricanes Harvey and Michael exploded in strength in similar ways.

Laura went from a tropical storm to a major hurricane in less than 24 hours, sending coastal residents scrambling to prepare. Hurricanes Harvey and Michael exploded in strength in similar ways.

Hurricanes Harvey, Michael and now Laura all had rapid intensification, but is it really becoming more common?

Companies are eager to mine the deep ocean for valuable mineral deposits. But scientists are concerned about impacts on sea life, including creatures that haven't even been discovered yet.

Born on July 30, 1920, geologist and cartographer Tharp changed scientific thinking about what lay at the bottom of the ocean – not a featureless flat, but rugged and varied terrain.

Microscopic ocean phytoplankton feed a "biological pump" that carries carbon from the surface to deep waters. Scientists have found that this process stores much more carbon than previously thought.

Researchers are using a newly developed satellite tag to study previously unknown aspects of tiger shark reproduction. This approach could be used on other difficult-to-study shark species.