Geography

Large-scale tornado outbreaks increasing in frequency

Large-scale tornado outbreaks increasing in frequency

The frequency of large-scale tornado outbreaks is increasing in the United States, particularly when it comes to the most extreme events, according to research...
Humans Occupied Tibetan Plateau Thousands of Years Earlier than Previously Thought

Humans occupied Tibetan Plateau thousands of years earlier than previously thought

A new analysis of an archeological site in the high mountains of Tibet suggests that permanent residents may have set up camp thousands of...
South American fossil tomatillos show nightshades evolved earlier than thought

South American fossil tomatillos show nightshades evolved earlier than thought

Delicate fossil remains of tomatillos found in Patagonia, Argentina, show that this branch of the economically important family that also includes potatoes, peppers, tobacco,...
Arctic sea ice loss impacts beluga whale migration

Arctic sea ice loss impacts beluga whale migration

The annual migration of some beluga whales in Alaska is altered by sea ice changes in the Arctic, while other belugas do not appear...
280 million-year-old fossil reveals origins of chimaeroid fishes

280 million-year-old fossil reveals origins of chimaeroid fishes

High-definition CT scans of the fossilized skull of a 280 million-year-old fish reveal the origin of chimaeras, a group of cartilaginous fish related to...
volcanic eruptions

New study estimates frequency of volcanic eruptions

Holidaymakers concerned about fresh volcanic eruptions causing flight-disrupting ash clouds might be reassured by a study setting out the first reliable estimates of their...
Fossil fuel formation: Key to atmosphere’s oxygen?

Fossil fuel formation: Key to atmosphere’s oxygen?

For the development of animals, nothing -- with the exception of DNA -- may be more important than oxygen in the atmosphere. Oxygen enables the...
leap second

Space Timekeeping: NASA’s SDO adds leap second to master clock

On Dec. 31, 2016, official clocks around the world will add a leap second just before midnight Coordinated Universal Time — which corresponds to...
Flood threats changing across US

Flood threats changing across US

The risk of flooding in the United States is changing regionally, and the reasons could be shifting rainfall patterns and the amount of water...
Textbook story of how humans populated America is 'biologically unviable'

Textbook story of how humans populated America is ‘biologically unviable’

The established theory about the route by which Ice Age peoples first reached the present-day United States has been challenged by an unprecedented study...