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For decades, the dry season in the Amazon rainforest has been getting drier. A new study, published on Tuesday, found that about 75 percent of the decrease in rainfall is directly linked to deforestation. The study, in Nature Communications, also found that tree loss was partly responsible for increased heat across the Amazon. Since 1985, the hottest days in the Amazon have warmed by about 2 degrees Celsius. About 16 percent of that increase, the researchers found, was because of [...]

A venomous creature from the Amazon rainforest may hold the key to fighting one of the deadliest cancers affecting women ... A venomous creature from the Amazon rainforest may hold the key to fighting one of the deadliest cancers affecting women today. According to the American Cancer Society, skin cancers aside, breast cancer is the most common cancer among women in the U.S.—accounting for about 30% of all new female cancer cases annually, with an estimated 42,170 women expected to [...]

An almost overlooked fossil discovered in a Brazilian museum collection has revealed the oldest ant specimen known to science, according to new research. The prehistoric ant lived among dinosaurs 113 million years ago — several millennia before previously found ants — and had an unusual way to kill its prey. Anderson Lepeco, a researcher at the Museum of Zoology of the University of São Paulo, said he came across the “extraordinary” specimen in September 2024 [...]

“Heavy alcohol consumption is a major global health concern linked to increased health problems and death,” Alberto Fernando Oliveira Justo, co-author of the study, said “We looked at how alcohol affects the brain as people get older. Our research shows that heavy alcohol consumption is damaging to the brain, which can lead to memory and thinking problems,” he added. What's hyaline atherosclerosis? Hyaline atherosclerosis causes blood vessels to narrow, thicken [...]

  Vaccine breakthrough. Brazil's Butantan health research institute submitted the world's first one-dose dengue vaccine to regulators for approval this week. The vaccine was developed through a yearslong partnership with the U.S. National Institutes of Health. Butantan hailed it as a breakthrough in a year when warm temperatures have caused dengue cases and deaths to spike in the Americas. Brazil currently uses a two-dose dengue vaccine made by Japanese firm Qdenga in its [...]

While it sounds like a cricket, it's not an insect: It's an extremely small frog. The recently discovered animal is one of the smallest known vertebrates on Earth. “We are talking about the limits of life size on Earth,” said LuÃs Felipe Toledo, a herpetologist at the University of Campinas in Brazil. He and colleagues described the frog in a study published last week in the journal PeerJ, naming it Brachycephalus dacnis after the Dacnis conservation project [...]

Scientists in Brazil found microplastics in the brain tissue of cadavers, according to a new study published Monday in the journal JAMA Network Open   Mounting research over the last few years has found microplastics in nearly every organ in the body, as well as in the bloodstream and in plaque that clogs arteries . Whether these ubiquitous pollutants can reach the human brain has been a primary concern for scientists. The latest research looked at a part of the brain called the [...]

Researchers in Brazil have discovered that both Mayaro and chikungunya viruses are unexpectedly circulating in the Amazon rainforest at the same time. This discovery overturns the belief that antibodies from one virus would prevent an infection influx from the other in the same area. Samples analyzed between December 2018 and December 2021 showed outbreaks of both infections in Roraima, Brazil's northernmost state. Mayaro and chikungunya are arboviruses, viruses transmitted by [...]

Joao Miguel Alves-Nunes from the Butantan Institute used jararacas — a highly venomous viper occurring across South America that is responsible for biting some 20,000 people per year — for his research. The results gleaned from this risky endeavor in the name of science, which could save lives, were published this month in the journal Nature In an interview with the journal Science , Alves-Nunes said that there had previously been little research on what factors cause snakes [...]