Notebook
- Paleontology
This giant marsupial was a seasonal migrant
A new analysis suggests that Diprotodon optatum, a giant plant-eating marsupial that went extinct about 40,000 years ago, migrated long distances, much like today’s zebras and wildebeests.
- Health & Medicine
About 1 in 5 teens has had a concussion
Almost 20 percent of U.S. teens have had at least one diagnosed concussion in the past, an analysis of a 2016 national survey finds.
- Psychology
Confusion lingers over health-related pros and cons of marijuana
50 years ago, the effects of chronic marijuana smoking on mental health were hazy. They still are.
- Life
This biochemist brews a wild beer
Wild beer studies are teaching scientists and brewers about the tropical fruit smell and sour taste of success.
- Animals
3-D scans of fossils suggest new fish family tree
Analysis of specimens from China implies ray-finned fishes evolved later than previously thought.
- Animals
A researcher reveals the shocking truth about electric eels
A biologist records the electrical current traveling through his arm during an electric eel’s defensive leap attack.
- Environment
Air pollution takes a toll on solar energy
Dust and other tiny air pollutants can reduce solar energy output by as much as 25 percent in parts of the world.
- Tech
50 years ago, West Germany embraced nuclear power
In 1967, Germany gave nuclear power a try. Today, the country is trading nukes for renewables.
- Climate
Rising temperatures threaten heat-tolerant aardvarks
Aardvarks may get a roundabout hit from climate change — less food.
- Planetary Science
Moons of Uranus face future collision
By studying variations in the rings of Uranus, researchers have determined the mass and density of the planet’s moon Cressida.
- Animals
This sea snake looks like a banana and hunts like a Slinky
A newly identified sea snake subspecies is known to live in a single gulf off the Pacific coast of Costa Rica.
- Physics
Scientists create the most cubic form of ice crystals yet
Ice has taken on a strange structure, with its water molecules arranged in nearly perfect cubes.
