Terras raras: o que são, onde estão e por que os EUA se importam com elas
Reservas brasileiras de terras raras despertam interesse dos EUA em meio a impasse comercial com Trump e podem entrar na disputa por minerais estratégicos Por Poliana Casemiro As chamadas terras raras são um grupo de 17 elementos químicos encontrados em abundância em vários países. A maior parte desses minerais está concentrada em dois pontos: na […]
Cérebro reage com defesa imunológica só de ver pessoas doentes se aproximando, diz pesquisa
Pesquisadores identificam que o cérebro reage como se estivesse diante de uma infecção real ao ver sinais de doença. Estudo foi publicado na revista Nature Neuroscience. Pesquisadores descobriram que o cérebro ativa células imunológicas imitando a resposta a uma infecção real apenas ao ver alguém doente se aproximando. O estudo foi conduzido por cientistas da […]
Weighing the elements
By Kit Chapman Why do the atomic weights on the periodic table keep changing? Kit Chapman meets the team behind the decimal places. It’s easy to think the periodic table never changes. It’s found on the wall of every lab and science classroom in the world. It’s a guide to the building blocks of matter, […]
Neuropeptides emerge as primary messengers in brain’s fear and panic circuits
By Anna Demming Recent advances in measurement techniques have shed light on the different roles of various biomolecules during frightening and stressful situations. Anna Demming looks at how it may lead to new therapeutic interventions for conditions like PTSD ‘Any noise at all and I can react,’ says Paul on a video by the […]
How polarized and UV-blocking sunglasses protect our eyes
ll sunglasses will darken a view somewhat, but they may not reduce glare. For that, you’ll need polarizing lenses. And to protect the eyes from the sun’s damaging rays, the lenses will have to be treated even more. By Tejasri Gururaj August 5, 2025 at 6:30 am Bright sunlight can flash off water, glass or […]
Predictions under pressure: Using AI to study porous materials
The cubes’ internal structures are based on different porous materials, including bone and wood. by Maddie Go, Duke University Advances in artificial intelligence for porous materials design could impact a wide variety of fields, from orthopedic implants to next-generation batteries. The world is full of holes. Bones, rocks, wood, concrete…look at any of these materials […]
The hidden mental health danger in today’s high-THC cannabis
“Cannabis from the 2000s is not the same as in 2025,” said coauthor Dr. Nicholas Fabiano, MD, resident and researcher with the Department of Psychiatry, University of Ottawa, Ottawa, Ontario. “THC content has increased by 5 times. This is likely a significant driver in the increasing link between cannabis use and schizophrenia.” the last […]
