Mental Floss

HEALTH





An enviable spread.

Are N95 masks reusable? It depends on a few factors—here’s how to tell when yours is ready to be replaced.

Ellen Gutoskey


Watercolor drawing of the leg of a patient, age 50, who had scurvy for 12 months' standing.

Scurvy’s mysterious cause wasn’t identified until the 20th century. Here are a few facts from the disease's long and miserable history.

Kat Long












Brzozowska/iStock via Getty Images

Based on public health, personal safety, and infrastructure, these are the safest cities in the world in 2021.

Michele Debczak