After Colorado voted to legalize marijuana in 2012, doctors in Denver noticed a surprising trend. Most people who visited the emergency room for cannabis-related complaints had smoked the drug. But those who ingested the drug were more likely to suffer more severe effects, including psychiatric symptoms and heart problems. Edibles — marijuana-laced products such as […]
SAN FRANCISCO — For some older people, the brain boosts from exercise can be almost immediate. Improvements in their thinking abilities after a single 20-minute bout of pedaling a stationary bike mirrored those produced by three months of regular exercise, according to a preliminary study presented March 24 at the annual meeting of the Cognitive […]
NEW ORLEANS — For couples who have suffered repeated miscarriages, it may be useful to scrutinize the man’s reproductive health as closely as the woman’s. Some miscarriages may be linked to abnormalities in semen, a study finds. Researchers analyzed semen from 49 men whose partners had lost three or more consecutive pregnancies before the 20-week […]
Dumping literal tons of hot volcanic material down a lab flume may finally have revealed how searing mixtures of hot gas and rock travel so far from volcanic eruptions. These pyroclastic flows can travel tens to hundreds of kilometers over rough terrain and even uphill (SN: 7/7/18, p. 32). Despite being made of gritty volcanic […]
Nudging an older person’s brain waves into sync temporarily boosts her recall powers. After about a half hour of precisely calibrated stimulation, people were better able to mentally juggle images seen on a screen, researchers report April 8 in Nature Neuroscience. The results are the latest example of technology that aims to improve thinking by […]
ORLANDO — A common food additive may make it more difficult to fight the flu. Vaccinated mice that got food containing the additive, tert-butylhydroquinone (tBHQ), took three days longer to recover from the flu than mice that ate tBHQ-free food. The unpublished result suggests the common additive may make flu vaccines less effective, toxicologist Robert […]
Brains have long been star subjects for neuroscientists. But the typical “brain in a jar” experiments that focus on one subject in isolation may be missing a huge part of what makes us human — our social ties. “There’s this assumption that we can understand how the mind works by just looking at individual minds, […]
WASHINGTON — The tale of the first horseback riders may be written on the bones of the ancient Yamnaya people. Five excavated skeletons dated to about 3000 to 2500 B.C. show clear signs of physical stress that hint these Yamnaya individuals may have frequently ridden horses, researchers reported March 3 at the American Association for […]
For generations of dogs, home is the radioactive remains of the Chernobyl Nuclear Power Plant. In the first genetic analysis of these animals, scientists have discovered that dogs living in the power plant industrial area are genetically distinct from dogs living farther away. Though the team could distinguish between dog populations, the researchers did not […]
SpaceX’s rapidly growing fleet of Starlink internet satellites now make up half of all active satellites in Earth orbit. On February 27, the aerospace company launched 21 new satellites to join its broadband internet Starlink fleet. That brought the total number of active Starlink satellites to 3,660, or about 50 percent of the nearly 7,300 […]