Researchers found that a stress hormone impairs stem cells necessary for hair growth in mice. The findings suggest potential ways to treat hair loss caused by chronic stress.

After a single dose of the Pfizer-BioNTech vaccine, people with a prior COVID-19 infection had antibody levels similar to those of people without prior infection after two vaccine doses.

Researchers created a “sweat sticker” for measuring chloride concentrations in sweat, a sign of cystic fibrosis.