Daniela Hernandez

Scientists around the world are struggling to sort out the significance of a new variant of the coronavirus spreading rapidly through the U.K., as it and certain other countries take drastic action to curb further transmission.

Neurologists are searching for new ways to crack the riddle of spasmodic dysphonia.

The over-reliance on testing highlights another hole in the Olympics’ pandemic control, experts say. “It’s mind-blowing.”

The pandemic has made surviving the isolation and anxiety of competing in the Olympics even more difficult for athletes.

Isolation exacerbated the devastation felt by athletes who tested positive for Covid-19 in Tokyo. One athlete built a companion named Bob for company.

Mexican gymnasts often don’t have the same resources available to their American counterparts, making it more difficult for them to train and compete on the world’s stage.

With a new wave rising, people and institutions are making decisions that reflect changing attitudes toward the threat that Covid-19 represents.

Neuroscientists put fish and rats in the driver’s seat in experiments intended to help learn how brains adapt to change

New, high-resolution map of the brain will help researchers better diagnose and treat diseases.

Social media is full of posts about adrenal cocktails and how they can stave off lethargy, trouble sleeping and even depression. WSJ’s Daniela Hernandez breaks down what they are and their potential health risks. Illustration: Elizabeth Smelov