LearningBD

The remote south Atlantic island of St. Helena boasts an international celebrity: the tortoise Jonathan, the oldest living land animal. At 194 years old, he has outlasted the expected lifespan for an Aldabra giant tortoise (Aldabrachelys gigantea) by about a century. Now, scientists have identified a range of unique genetic and epigenetic traits that may

The difficulty of this coloring problem will depend on the layout of the graph, the number of allowed colors, and the specific set of constraints. Khot was interested in cases where the best possible coloring satisfies most but not all of the constraints — say, 99% of them. Finding this near-perfect coloring is a difficult

Researchers have observed the strongest candidate yet for a “microblazar” — a dazzling object that has long been predicted to exist but never spotted. Observations of microblazars would give astronomers closer views of black holes emitting powerful jets of energy and help them understand how these extreme objects behave. Blazars are some of the most

Archaeologists have unearthed evidence that men, women and children were subjected to violence within their communities in ancient Scandinavia — and that these victims were buried in unusual places, such as pits or wells or under a family’s house or yard. During the Scandinavian Iron Age and Viking Age (from roughly 500 B.C. to A.D.

QUICK FACTS Where is it? Lake Powell, Utah [37.47537121, -110.70474226] What’s in the photo? A “sunglint” transforming a reservoir into a giant silver river Who took the photo? An unnamed astronaut on board the International Space Station When was it taken? 2016 This eye-catching astronaut photo mosaic shows a rare “sunglint” transforming a snaking reservoir

You may have watched the moon block out the sun during a solar eclipse, but have you ever seen it do that to a planet? Early Tuesday (Oct. 6) morning, skywatchers across much of eastern North America will have an opportunity to watch a crescent moon pass directly in front of Jupiter. The rare alignment

Throughout the summer of 2026, there were plenty of signs of what was to come. Every week, it seemed, artificial intelligence models were offering proofs of decades-old mathematical conjectures. So what happened on September 8 shouldn’t have been a complete surprise. And yet to many it felt sudden, almost violent. OpenAI announced that its models