Science

Geochemistry

Witnesses to a primitive Earth

Rocks found in Minas Gerais contain evidence of pockets of oxygen from 400 million years before the gas accumulated in the planet’s atmosphere

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Climate

The Amazon produces 8% of the planet’s methane

Most of the gas emitted in the biome comes from wetlands, but the rise in livestock farming and fires has increased emissions associated with human occupation

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COVID-19

The efficiency of masks

Tests reveal how and to what extent different types of masks limit the airborne spread of infectious diseases

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COVID-19

The pandemic accelerates

High transmissibility of the Omicron variant reinforces the importance of vaccinating children, the last age group to be immunized

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INTERVIEW

Karen Strier: Four decades with the muriquis

American anthropologist has contributed to primate conservation in the Atlantic Forest and trained almost 80 Brazilian researchers

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Interview

Rodolfo Nogueira: Stunningly real dinosaurs

How a paleoartist combines technical and scientific knowledge to recreate extinct animals with a wealth of detail

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Paleoecology

Caribbean incursions

Studies back up the hypothesis that the Caribbean Sea flooded parts of the western Amazon between 23 and 10 million years ago

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Geophysics

Shifting sands

Studies suggest crescent-shaped dunes can move and interact in five different ways

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Genetics

The rise and fall of Tupi

Speakers of the language may have numbered 4 to 5 million a millennium ago but began declining sharply before Europeans arrived on the continent

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COVID-19

The uncertainties of omicron

New SARS-CoV-2 variant is highly transmissible, but for now, there is no evidence that it causes more severe disease or more deaths

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Astrophysics

The world’s largest space telescope

The James Webb Space Telescope is due to be launched in late December; Brazilian astronomers will lead two observation programs and collaborate on another nine

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Endocrinology

A delicate balance

Brazilians identify new areas of the brain's hunger circuit

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Physics

From metal to an insulator

Twisting a two-dimensional nanofilm allows an electric current to progressively pass through it

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HEALTH

Pioneering immunization

Malaria vaccine recommended for children in Africa by the WHO is the first to protect humans from a parasite

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Cosmology

Super-impact on Titan

Collision with celestial body may have created an environment on Saturn's largest moon in which primitive life could emerge

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Ecology

Green deforestation

Intensive açaí management threatens biodiversity in Amazonian estuarine forests

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Climate

Cerrado under threat

The Cerrado is getting hotter, drier, and more prone to fire

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Cover

Geography of flavors

In the last two decades, Brazil has created 88 geographical indications for products such as coffee, cheese, and wine

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Covid-19

Confidence in vaccines

Vaccination rate in Brazil greater than in developed countries

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ASTROPHYSICS

Devourers of worlds

At least a quarter of Sun-like stars may have swallowed Earth-like planets

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Heritage

Relevant rocks

Scientists identify 36 areas in Brazil with highly diverse geological structures and natural landscapes

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Biology

Rainforest marsupials

Study suggests opossums emerged in the Amazon about 40 million years ago

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Atmosphere

Greatest threat to global health

Editorial published in more than 200 medical journals highlights the risks of ignoring climate change

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Atmosphere

Pollution that causes global cooling

Aerosol particles that worsen air quality and damage human health also reduce global warming by a third

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Physics/Chemistry

Free passage through the skin

Simulations indicate that applying an electric field stimulates the formation of "blisters" that turn the epidermis into a gateway for drugs to enter the body

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Physiology

A vein under pressure

Following transplantation to the heart in surgeries to treat coronary artery disease, saphenous veins undergo drastic restructuring and can become clogged

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Soil science

Tracking crime

Soil sample analysis can aid investigations and help solve crimes

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Cover

Boosted atmosphere

Studies indicate that almost 80% of 405 recent extreme events were more frequent or intense due to changes caused by humans

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Cover

Climate in the Anthropocene

Human activity is driving global warming and amplifying extreme droughts and rainfall, says the IPCC

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Covid-19

Delta advances

Delta variant threatening control of the COVID-19 pandemic

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