From salamanders to monkeys, many species get more violent at warmer temperatures — a trend that may shape their social structures as the world warms. ... Read full Story
Researchers found that fruit fly sperm push against one another and align in orderly bundles, preventing knots that could block reproduction. ... Read full Story
By Science News | Meghan Rosen | 9/2/2025 11:00 AM
Cuban brown anoles have the highest blood lead levels of any vertebrate known — three times that of the previous record holder, the Nile crocodile. ... Read full Story
By Science News | Jake Buehler | 8/28/2025 2:00 PM
To make horses rideable during domestication, people may have inadvertently targeted a mutation in horses to strengthen their backs and their balance. ... Read full Story
By Science News | Jake Buehler | 8/21/2025 2:00 PM
In light-polluted landscapes, birds' singing time is an average of 50 minutes longer per day. It's still unclear if this hurts bird health or helps. ... Read full Story
Infrared cameras in Costa Rica revealed that the world’s largest carnivorous bat maintains close social bonds through wing wraps and prey sharing. ... Read full Story
In-flight defecation may help the birds stay away from feces that can contain pathogens such as bird flu while also fertilizing the ocean. ... Read full Story
Producing a male-specific protein in digestion-related neurons may have led to the evolution of an odd “romantic” barfing behavior in one species of fruit flies. ... Read full Story
By Science News | Jude Coleman | 8/12/2025 7:01 PM
In the lab, higher temperatures during fall migration led monarchs to break their reproductive pause, increasing their risk of death. ... Read full Story
The invasive spotted lanternfly has spread to 17 states and can threaten vineyards. But bats, fungi, dogs and even trees may help control them. ... Read full Story
By Science News | Susan Milius | 8/5/2025 12:00 PM
The unique architecture of some ball-like plants high in trees in Fiji lets violent ants live peacefully and feed the plant with valuable droppings. ... Read full Story
Probiotics containing Lactobacillus gasseri Lg-36 prevented C. difficile infections in mice, but L. acidophilus probiotics made infection more likely. ... Read full Story
After a sprint, the temperature of the beetle Onymacris plana drops. Efficient running, a body built for cooling and a little bit of lift all help. ... Read full Story
Merriam-Webster's Word of the Day for November 2, 2025 is:
arbitrary \AHR-buh-trair-ee\ adjective
Arbitrary describes something that is not planned or chosen for a particular reason, is not based on reason or evidence, or is done without concern for what is fair or right.
// Because the committee wasn’t transparent about the selection process, the results of the process appeared to be wholly arbitrary.
// An arbitrary number will be assigned to each participant.
“The authority of the crown, contemporaries believed, was instituted by God to rule the kingdom and its people. England’s sovereign was required to be both a warrior and a judge, to protect the realm from external attack and internal anarchy. To depose the king, therefore, was to risk everything—worldly security and immortal soul—by challenging the order of God’s creation. Such devastatingly radical action could never be justified unless kingship became tyranny: rule by arbitrary will rather than law, threatening the interests of kingdom and people instead of defending them.” — Helen Castor, The Eagle and the Hart: The Tragedy of Richard II and Henry IV, 2024
Did you know?
Donning black robes and a powdered wig to learn about arbitrary might seem to be an arbitrary—that is, random or capricious—choice, but it would in fact jibe with the word’s etymology. Arbitrary comes from the Latin noun arbiter, which means “judge” and is the source of the English word arbiter, also meaning “judge.” In English, arbitrary first meant “depending upon choice or discretion” and was specifically used to indicate the sort of decision (as for punishment) left up to the expert determination of a judge rather than defined by law. Today, it can also be used for anything determined by or as if by chance or whim.