The existence of supermassive black holes in the early universe has never made much sense to astronomers. Sightings since 2006 have shown that gargantuan monsters with masses of at least a billion suns were already in place when the universe was less than a billion years old – far too early for them to have […]

It certainly feels like the northeastern United States is getting snowier. In the first two weeks of March, three winter storms slammed into the northeast corridor from Washington, D.C., to Boston. Over the last decade, a flurry of extreme winter storms has struck the region, giving birth to clever portmanteau names such as Snowpocalypse (2009), […]

Tattoos may have staying power because of a hand off between generations of immune cells known as macrophages, say a group of French researchers. If true, this would overturn notions that tattoo ink persists in connective tissue or in long-lasting macrophages. Immunologist Sandrine Henri of the Immunology Center of Marseille-Luminy, in France, and colleagues tattooed […]

ZeptonewtonZEP-toe-new-ton n.A unit of force equal to one billionth of a trillionth of a newton. An itty-bitty object can be used to suss out teeny-weeny forces. Scientists used an atom of the element ytterbium to sense an electromagnetic force smaller than 100 zeptonewtons, researchers report online March 23 in Science Advances. That’s less than 0.0000000000000000001 […]

“Pop” goes the knuckle — but why? Scientists disagree over why cracking your knuckles makes noise. Now, a new mathematical explanation suggests the sound results from the partial collapse of tiny gas bubbles in the joints’ fluid. Most explanations of knuckle noise involve bubbles, which form under the low pressures induced by finger manipulations that […]

Shimmering, gelatinous comb jellies wouldn’t appear to have much to hide. But their mostly see-through bodies cloak a nervous system unlike that of any other known animal, researchers report in the April 21 Science. In the nervous systems of everything from anemones to aardvarks, electrical impulses pass between nerve cells, allowing for signals to move […]

Northern elephant seals are the true masters of the power nap. On long trips out to sea, the seals snooze less than 20 minutes at a time, researchers report in the April 21 Science. The animals average just two hours of shut-eye per day while swimming offshore for months — rivaling African elephants for the […]

MINNEAPOLIS — Bubbles of radiation billowing from the galactic center may have started as a stream of electrons and their antimatter counterparts, positrons, new observations suggest. An excess of positrons zipping past Earth suggests that the bubbles are the result of a burp from our galaxy’s supermassive black hole after a meal millions of years […]

Since early 2022, sea urchins have been mysteriously dying off across the Caribbean. Now scientists say they have identified the main culprit: a type of relatively large, single-celled marine microorganism called a scuticociliate. The discovery is a little surprising given that “ciliates are not normally seen as agents of mass mortality,” says Ian Hewson, a […]

The classical view of how the human brain controls voluntary movement might not tell the whole story. That map of the primary motor cortex — the motor homunculus — shows how this brain region is divided into sections assigned to each body part that can be controlled voluntarily (SN: 6/16/15). It puts your toes next […]