If you look up invasive species in a textbook, there's a good chance you'll find a picture of a brown tree snake. Native to Australia and the South Pacific, the brown tree snake arrived on Guam sometime after World War II, possibly by stowing away aboard cargo planes.
Imagine searching for a gemstone in a dark cave: You use a flashlight, looking for a rainbow-colored glint in the darkness. Now, imagine 10 other people in the cave with you, using different-colored flashlights at the same time. Suddenly, you can no longer tell which light is coming from your gemstone, which light is from another flashlight or which light is coming from a reflection off another unknown object. That is what echolocation with multiple, overlapping frequencies would be like. But now, imagine if every person in the cave were using a flashlight of the same color. The glint from the gemstone would be much easier to see.
Photographs can reveal things that are otherwise impossible for the naked eye to see, be they distant galaxies or microscopic cells. Researchers at Osaka Metropolitan University have developed a practical and versatile imaging technique that makes another usually invisible phenomenon visible: surface plasmon polaritons (SPPs), light waves that travel along metal surfaces.
Nitrate contamination of drinking water poses a major health concern, particularly in agricultural communities where fertilizers, livestock manure and septic systems can leach nitrates into groundwater. Many rural households rely on private water wells, which may not be routinely tested, leading some to consume contaminated water without realizing it.
Anticancer prodrugs have attracted significant attention from the medical and scientific communities in recent years because of their potential to improve treatment precision while reducing side effects. These drugs are engineered to remain inactive until they are activated at specific sites or under particular physiological conditions within the body, at which point they release their therapeutic effect.
For more than a century, scientists have sought to reconstruct human evolution using diverse lines of evidence, including fossils, genetic variation across populations and ancient DNA. Building on these approaches, researchers are increasingly using large population biobanks to investigate how natural selection continues to shape the genomes of living populations.
A learner stands in a room with a bottle, a cup and a book. The task is to figure out, step by step, where each object belongs in the room. Under the table? Or perhaps on the chair? A humanoid robot gives the instructions—but in Swahili, a language the learner does not know. To solve the puzzle, the learner must gradually decipher what the robot is saying.
Researchers from the University of Amsterdam and the University of New South Wales have answered a question that has been around for decades: whether ions of the metal ytterbium can enter certain long-lived, nearly stable states and, if so, for how long. The measured long-lived states may find applications in quantum computers and atomic clocks.
Chinese astronomers report the detection of a peculiar optical transient event that occurred in the center of a dwarf galaxy. The newly discovered event, designated AT2019ijn, is a fast-rising, slow-decaying blue optical transient with exceptionally bright radio emission. The finding was detailed in a paper published July 6 in The Astrophysical Journal Letters.
Historians and archaeologists know that maize was a central food source and cultural symbol across the ancient Maya world, but much of what is known has come from studies focused on large Maya cities and elite burials.
All cells in the human body—and the motions they enable, from our beating hearts to our wiggling toes—use energy generated by a molecule called ATP. Its energy is thought to be released to fuel cellular processes in only one way: when ATP's decomposition is initiated by an enzyme, a specific type of protein.
SpaceX's mammoth Starship rocket blasted off Friday on another test flight stretching halfway around the world, this time releasing 20 of the most advanced Starlinks.
Whale sharks (Rhincodon typus)—the world's biggest fish—are one of the most charismatic marine species. They connect with the hearts of anyone lucky enough to encounter them, making people deeply curious about their lives and invested in their conservation.
Dozens of archaeological sites were destroyed by looting during Syria's civil war, which began in 2011 and lasted until 2024. Because the last comprehensive analysis was published in 2017, the extent of more recent damage to cultural heritage sites since 2016—including at UNESCO World Heritage sites such as Palmyra, long-running archaeological excavations like Mari, and the ancient Roman city of Apamea, known for its Great Colonnade—has been largely unknown.
Swidden agriculture—often called "slash-and-burn"—has been practiced on every inhabited continent throughout human history, and for decades it has been blamed for the destruction of the world's rainforests. However, a new study of more than 18,000 forest patches around the world found that the environmental impact of swidden is more nuanced and less destructive than the term "slash-and-burn" suggests—and that unwritten social rules in small societies, not government oversight, often regulate land use closely enough to support both harvests and forest regeneration sustainably over time.
---- End of list of PHYS ORG Articles on this page 2 of 2 total pages ----