Human tears could carry a flood of useful information. With just a few drops, a new technique can spot eye disease and even glimpse signs of diabetes, scientists report July 20 in ACS Nano. “We wanted to demonstrate the potential of using tears to detect disease,” says Fei Liu, a biomedical engineer at Wenzhou Medical […]
A dog’s brain is wired for smell. Now, a new map shows just how extensive that wiring is. Powerful nerve connections link the dog nose to wide swaths of the brain, researchers report July 11 in the Journal of Neuroscience. One of these canine connections, a hefty link between areas that handle smell and vision, […]
Two partial skeletons unearthed in northeastern China have dashed the record for the oldest avian relatives of today’s birds. The remains belonged to a species, Archaeornithura meemannae, that lived 130.7 million years ago — about 6 million years earlier than the previous record holders. Fossil hunters discovered bones of the hummingbird-sized creatures embedded in siltstone […]
The 18-year-old had stabbed himself four times in the neck and chest with a pair of scissors. Alone in his dorm room, he had suddenly felt trapped, convinced that the only way to get out was to kill himself. When he woke up hours later in a pool of blood, the psychedelic trip that had […]
A zap to the head can stretch the time between intention and action, a new study finds. The results help illuminate how intentions arise in the brain. The study, published in the May 6 Journal of Neuroscience, “provides fascinating new clues” about the process of internal decision making, says neuroscientist Gabriel Kreiman of Harvard University. […]
Earth — a planet of oceans, rivers and rainforests — grew up in an interplanetary desert. When the solar system formed about 4.6 billion years ago, shards of calcium- and aluminum-rich minerals stuck together, building ever-larger pebbles and boulders that smashed together and assembled the rocky planets, including Earth. But Earth’s signature ingredient was nowhere […]
Free-range planetsAstronomers are puzzling over some space oddities: planets that don’t orbit stars. In “Wandering worlds” (SN: 4/4/15, p. 22), Ashley Yeager explored how these lonely rogues may alter the definition of a planet. Tim Geho wanted to know more about how scientists locate homeless worlds. “Where does the light come from that allows rogue […]
I blame my love for science fiction mostly on my mother, although my older brother Nathaniel probably should also take some of the heat. Both were voracious readers, leaving piles of books around the house, most of them sci-fi, that I couldn’t avoid escaping into.Fans of science fiction will find a few items in this […]
Many of the world’s largest herbivores are threatened with extinction, scientists reported last week in Science Advances. Some of them, such as giraffes and zebras, are at risk because they are hunted for their meat. But elephants, which also make the threatened list, are prized not for their flesh but for their two large ivory […]
On a sunny day at Zoo Atlanta in 2020, Kelly the African bush elephant reached for a snack and revealed something strange. High-speed cameras tracking her movements suggested that the skin on top of Kelly’s trunk stretched more than the skin underneath. “But that didn’t make any sense,” says Andrew Schulz, a mechanical engineer at […]