More Than Half of Police Killings Are Mislabeled, New Study Says

Researchers comparing information from death certificates with data from organizations that track police killings in the United States identified a startling discrepancy.

In Review, Top F.D.A. Scientists Question Imminent Need for Booster Shots

An article, written with other vaccine experts, put the regulators at odds with key federal health officials, including Dr. Anthony S. Fauci.

Medical Journals Call Climate Change the ‘Greatest Threat to Global Public Health’

An editorial published by more than 200 journals worldwide warned of ‘catastrophic harm to health that will be impossible to reverse.’

Can the Olympics Take the Heat?

Plus: squirrel acrobats, gecko navigators, hair thieves and other natural overachievers in the Friday edition of the Science Times newsletter.

Is Nose Hair Essential to Fighting Off Colds and Other Viral Illnesses?

Expert advice on whether trimming or waxing your nose hairs might increase the risk of respiratory infections.

Severe Covid Is More Often Fatal in Africa Than in Other Regions

Inadequate treatment for critically ill patients contributed to higher death rates in Africa, compared to other parts of the world, a study found.