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Earth.com (EUA)
Em 2026: 48 notícias
Desde 1995: 143 notícias
Exercise is good for your brain, but too much may alter its chemistry
Publicado em 02 de novembro de 2026
Excessive exercise may alter brain chemistry, raising dopamine levels during rest and offering clues to the sleep problems linked to overtraining.
Skipping a rest day might seem like a good way to get more out of a workout. But pushing the body too hard may also change what happens in the brain.
Mice that completed eight weeks of increasingly demanding treadmill running had higher dopamine levels in a brain region involved in memory and mood than untrained mice.
The difference appeared [...]
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Thousands of unknown viruses have been hiding in cities around the world
Publicado em 17 outubro 2026A global survey of 102 cities uncovered nearly 55,000 RNA viruses, most previously unknown to science, revealing a hidden world of viral diversity. Most of what people know about RNA viruses comes from the ones that make them sick, such as the flu, dengue, Zika, and the virus behind COVID-19. By examining everything from subway handrails to city sewage and soil, researchers discovered just how much viral diversity has gone unnoticed. Of nearly 55,000 RNA viruses an international team [...]ver notícia -
Tropical forests are heading toward a dangerous new climate reality
Publicado em 08 outubro 2026A new study warns that record-breaking temperatures could become normal across tropical forests within two decades, threatening trees and communities. The 2023-24 El Niño was brutal for tropical forests. Extreme heat and drought hit three quarters of them at the same time for months. A new study suggests that what felt like an exceptional disaster may be a preview of normal conditions within two decades, even in years when there is no El Niño . The research was led by Johanna Van [...]ver notícia -
Two stars born together should be identical, but one appears to have eaten a planet
Publicado em 20 setembro 2026Two stars that formed from the same cloud of gas should be chemically identical. But one pair of Sun-like stars breaks that rule. Astronomers who reanalyzed light from the two stars now have an explanation: one of them appears to have swallowed at least 11 Earths’ worth of rock. The evidence is beryllium, a rare element that stars don’t make. The researchers propose it as a longer-lasting sign of a swallowed planet than the lithium astronomers had been using. The two stars, named [...]ver notícia -
Amazon rain carries a hidden warning of severe drought
Publicado em 15 setembro 2026Rainwater in the Amazon carried a chemical warning of severe drought weeks before conditions reached their worst point.ver notícia -
Large mammals are secretly fertilizing tropical forests
Publicado em 25 agosto 2026Large mammals help shape forest floors by changing fallen plant material, soil acidity, and nutrient movement over time. Tropical forests need more than trees to stay healthy. Animals help by moving seeds, mixing the forest floor, and helping nutrients from dead leaves and plants return to the soil. When large mammals disappear, the forest may still look healthy, but important changes can begin in the soil and fallen leaves below. A 14-year experiment in Brazil found that [...]ver notícia -
Air pollution may harm the tissues that keep our teeth in place
Publicado em 20 agosto 2026PM2.5 air pollution damages oral tissue, worsens inflammation, and accelerates bone loss around the teeth. Everyone knows polluted air is bad for the lungs and heart. What is less obvious is that it may also damage the mouth, gradually breaking down the tissue that helps hold teeth in place. That is the conclusion of a new study led by São Paulo State University and the University of São Paulo . This is the first study to directly show that fine particulate matter changes oral [...]ver notícia -
Laser scans can pinpoint a tree’s weakest spot before pruning
Publicado em 08 agosto 2026A tree does not fall apart evenly. Cut the wrong branch, and the whole crown can end up leaning on one weak point instead of spreading the load out. A group of biologists and engineers in Brazil worked out a way to spot that weak point before a storm does. They turned a real tree into a set of numbers, then pushed simulated wind against it. The idea started as a hallway question. Marcos Silveira Buckeridge runs the Laboratory of Ecological Plant Physiology at the University of São [...]ver notícia -
Laser scans can pinpoint a tree's weakest spot before pruning
Publicado em 08 agosto 2026A tree does not fall apart evenly. Cut the wrong branch, and the whole crown can end up leaning on one weak point instead of spreading the load out. A group of biologists and engineers in Brazil worked out a way to spot that weak point before a storm does. They turned a real tree into a set of numbers, then pushed simulated wind against it. The idea started as a hallway question. Marcos Silveira Buckeridge runs the Laboratory of Ecological Plant Physiology at the University of São [...]ver notícia -
Scientists can now trace illegal Amazon timber back to where it was cut
Publicado em 01 agosto 2026A map tracking the distribution of chemical isotopes in tree wood acoss the Amazon could become a powerful new weapon against illegal logging. The illegal timber trade remains one of the primary drivers of deforestation across the region. By analyzing the ratios of different isotopes in elements like oxygen, carbon, nitrogen, and strontium, researchers can identify where a piece of timber came from with much greater precision. This gives investigators a far more accurate way to trace [...]ver notícia