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The usual suspect has been caught, not red-handed but red-bellied. Since the beginning of the Zika virus outbreak in Brazil, health authorities and researchers have strongly suspected that the mosquito Aedes aegypti, known for spreading several deadly viruses, was also guilty of spreading Zika from one person to another. But direct evidence had been hard…

The health of sea ice between the poles couldn’t be more different. The extremes, US researchers say, boil down to geology.

Of all the species that have populated Earth at some time over the past 3.5 billion years, more than 95% have vanished — many of them in spectacular die-offs called mass extinctions. On that much, researchers can generally agree. Yet when it comes to taking stock of how much life exists today — and how…

Many people think evolution requires thousands or millions of years, but biologists know it can happen fast. Now, thanks to the genomic revolution, researchers can actually track the population-level genetic shifts that mark evolution in action—and they’re doing this in humans.

Researchers at Tsinghua University in Beijing have created a mirror-image version of a protein that performs two of the most fundamental processes of life: copying DNA and transcribing it into RNA. The work is a “small step” along the way to making mirror-image life forms.

Efforts to treat Huntington’s disease involve costly drugs way beyond the reach of the poor communities in South America who take part in research studies

Huge supercolliders aren’t the only way to search for new physical phenomena. A new generation of experiments that can fit on a tabletop are probing the nature of dark matter and dark energy and searching for evidence of extra dimensions.

New research examines a number of scenarios explaining the presence of Planet Nine, and finds that most of them have low probabilities.

New research has identified a potential way to reverse graying hair and treat skin pigment disorders. By studying stem cells in mice, scientists have found the molecular pathways responsible for creating the color of skin and hair.