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






Sleep isn't always as easy as babies make it look.

Vincent van Gogh’s favorite cure for insomnia was camphor. Don’t try that at home (or anywhere), kids.

Ellen Gutoskey








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