Ricardo Zorzetto

Astronautics

The private conquest of the Cosmos

A capsule of the company SpaceX flies to the International Space Station and may give the United States the capacity to put humans in orbit

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Evolution

The origin of the butterfly

Studies based on gene and fossil analysis estimate that butterflies emerged between 120 and 100 million years ago

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Physiology

An enemy unknown

Brazilian researchers find that fasting causes growth hormone to activate neurons that induce hunger and undermine weight loss

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Paleontology

The horned crocodile of Acre

New fossil belonged to the 31st known species of a group of reptiles that lived in South America between 23 million and 5 million years ago

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Archaeology

The water people

For 1,000 years, indigenous people in South America lived in stilt-house villages in the lowlands of present-day Maranhão

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Psychiatry

The other side of ayahuasca

Research teams from Natal and Ribeirão Preto conduct initial tests on antidepressant properties of ayahuasca tea made of leaves and bark from the Amazon

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Psychiatry

Battling persistent depression

Studies suggest that low doses of psychedelic anesthetics may be beneficial to people who do not respond to conventional medication

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Astronomy

Unusual Stars

Researchers puzzled by recent discoveries of stars with variable brightness

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Tropical diseases

A center for safeguarding health in the Amazon

Founded in 1936, the Evandro Chagas Institute produces world-leading research on infectious and parasitic diseases and environmental issues

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Interview

Pedro Fernando da Costa Vasconcelos: The return of yellow fever and Zika

Discoverer of more than 100 species of viruses in the Amazon, the virologist from the state of Pará says it's just a matter of time before there are new outbreaks of the two diseases

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Cover

Before memory loss

Psychiatric problems may be the first signs of Alzheimer’s disease

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Amazonia

Brother in the North

Emílio Goeldi Museum of Pará reaches 152nd anniversary with 4.5 million items preserved, but few protected

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Cover

The race for the best light

Sirius will compete with a fourth-generation facility inaugurated in 2016 in Sweden and another planned to begin operating in 2020 in France

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Cover

Leaping towards brilliance

In its final stage of construction, the latest-generation synchrotron light source could elevate the quality of Brazilian research

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HEALTH

Early-term births on the rise

In 2015, 40% of babies were born before reaching biological maturity, partly because of elective cesarean sections

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INTERVIEW

Antonio Sérgio Petrilli: A multifaceted physician

Pediatric oncologist Antonio Sérgio Petrilli describes how he built and now runs one of Brazil’s leading centers for research and treatment of childhood cancer

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Cover

The reasons for the decline in vaccinations

At least nine factors contribute to a reduction in childhood immunization and increase the risk of the reappearance of serious illnesses

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Cover

The race for the best light

Sirius will compete with both a fourth-generation facility inaugurated in 2016 in Sweden, and another planned to begin operating in 2020 in France

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Cover

Leaping towards brilliance

Now in its final stage of construction, the latest-generation synchrotron light source could elevate the quality of Brazilian research

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GEOSCIENCES

Polarized opinion

Declining strength of Earth's magnetic field fuels debate on the chances of the poles reversing for the first time in 780,000 years

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GEOLOGY

The rain that united two forests

Periods of heavy rainfall between 120,000 and 12,000 years ago may have connected the Atlantic Forest to the Amazon

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OBITUARY

The malaria vaccine pioneer

Ruth Nussenzweig died in New York City at 89 from a pulmonary embolism

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GEOSCIENCES

Scars of a cataclysm in Central Brazil

Rocks found in the states of Mato Grosso, Goiás, and São Paulo reveal earthquake and tsunami caused by a meteorite some 250 million years ago

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COVER

Some effects of manufactured foods

Recent studies stir controversy over the risks of eating processed foods that are high in preservatives, salt, sugar, and fats

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Cover

The mechanisms of aging

Studies of living cells and organisms identify genetic and molecular phenomena associated with physical and mental decline

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ASTROPHYSICS

Fireflies around Saturn

A Brazilian research team proposes a model to explain the origin of a tenuous ring around the second largest planet in the Solar System

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NEUROLOGY

Adolescent depression

Heightened reward-related brain activity may predict an increased risk for developing the disorder

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ENTOMOLOGY

Invisible moths

These very small Insects spend most of their lives as larvae inside stems and leaves

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INTERVIEW

Olival Freire Junior: A teller of controversial stories

A historian discusses the important role of dissent for the advancement of scientific knowledge

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Cover

Marcelle Soares-Santos: Collision hunter

Brazilian physicist searches for emissions of light of gravitational waves

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