Inside the Experimental Traps Scientists Set for Ghostly Neutrinos - WIRED

A collision may have left these galaxies without dark matter. That spells trouble for alternative gravity theories. The lack of dark matter in galaxies DF2, DF9, and DF4 (clockwise from left) was a shock to scientists, who speculate that they formed after an ancient collision.

Here’s what you’ll learn when you read this story:While many people have experienced encounters with what they think might be a ghost, studies trying to make sense of this scientifically have never found an explanation. Researchers compared accounts from three very different groups, looking for overlap. Spiritualists, extreme athletes, and psychiatric patients described strikingly similar ghosts, but no definitive cause emerged. Ghosts haunt our subconscious every Halloween. The living often wonder whether a hazy apparition, a sudden chill out of nowhere, or the echo of a disembodied voice might be coming from the spirit realm. Paranormal investigation shows aside, there has been no scientific way to prove this so far. They could be vestiges of the dead—or maybe they only exist in our imaginations. Perceiving ghosts is a phenomenon known as felt presence. Psychologists, neurologists, and neuropsychologists have tried to explain why people sense someone who isn’t there. Results are usually inconclusive. Sometimes, felt presence could be a side effect of bereavement or a hypnagogic illusion, which is experienced on the edge of falling asleep.

Μake us preferred on Google When ChatGPT first came out, along with the whole story around artificial intelligence, its creators promised us the moon and the stars. They told us AI would be the great “key” that opens doors for everyone, allowing a 24-year-old who just entered the job market to deliver work like a seasoned veteran. But things are not exactly like that. A new study from MIT brings us back down to earth, showing that AI may help you finish a job quickly, but in the end it teaches you nothing if you don’t already know the basics. NEWSLETTER TABLE TALKNever miss a story. Subscribe now. The most important news & topics every week in your inbox. This story is very reminiscent of the old “China shock,” which hit the market when China forced its way into global trade and many factories closed. Only now, the “blow” is not landing on industries but on offices. If young workers expect the computer to do everything for them, they risk falling into a major illusion: thinking they have become experts, while in reality they are just pushing buttons.

A core-collapse supernova occurs when a massive star reaches the end of its life. After running out of hydrogen and other light elements to burn, the star makes a last ditch effort to counter gravity, fusing ever heavier elements at an ever faster pace. Eventually it reaches the point where heavy fusion extracts energy from the core rather than adds it. The core rapidly contracts, then recoils. The resulting explosion rips the star apart and briefly outshines an entire galaxy. But not all giant stars end with a bang. Some of them experience a core collapse so quick and dense that the core squeezes itself into a black hole. These stars end with a whimper rather than a bang. So what exactly causes this difference? Why do some stars explode and others not? What key features distinguish between the two? The answer could lie in an aspect of neutrinos known as flavor.