In a rare case, the brown eyes of a 6-month-old boy with COVID-19 turned blue after he was given the antiviral favipiravir.
Deadly superbugs are unlikely to develop resistance to a new antibiotic produced by bacteria, scientists say.
The ancient predator, which scientists have named Venetorapter gassenae, also had a large beak and likely used its claws for climbing trees and picking prey apart.
From shrinking goats to a dimmer Earth, here are some of the lesser-known impacts of rising global temperatures.
Artificial intelligence can produce music that sounds similar to tunes people were listening to as they had their brains scanned, a collaborative study from Google and Osaka University shows.
Scientists simulated ancient viruses to see what impact they would have on the environment. While most had few consequences, 1% were capable of killing their hosts and disrupting ecosystems.
The rhesus macaques on Cayo Santiago that engaged in same-sex behavior were also found to have more babies, indicating an evolutionary advantage.
DNA analysis indicates the world's most common bee originated in northern Europe around 780,000 years ago, before spreading into East Africa and Arabia around 120,000 years later.
Two species of tropical flying squirrels have worked out that if they nibble grooves around nuts to store them between tree branches, they are preserved for longer.
The heightened mortality of "night owls" compared with "early birds" may come down to heavier smoking and higher alcohol consumption among night owls, a large study of people in Finland suggests.
Artificial intelligence models can use breast imaging data to pinpoint those at highest risk of getting breast cancer in the next five years, better than a standard approach.
An analysis of thousands of healthcare records adds to mounting evidence that people who get the shingles vaccine in their 70s may reduce their dementia risk over the following seven years.
A study involving more than 28,000 people strongly supports the idea that daily smoking shrinks the brain.
Waking and sleeping at inconsistent times may increase the risk of dying from cancer or heart disease death in middle-age and older adults.
Wild elephants play, help sick members of their species and babysit each other's young, suggesting they domesticated themselves.
COVID-19 may substantially increase the risk of developing autoimmune disease, a huge study of health records found.