What happens to your brain during a 20-minute nap
Short naps tend to stay in lighter sleep stages, so you wake up before the groggy deep-sleep phase. Studies link them to better alertness for a few hours afterward.
Grip strength is a surprisingly good predictor of overall health
Large population studies link weak grip strength to higher risk of heart disease and earlier death, independent of other measures.
What actually happens when you skip breakfast
The research is more mixed than either side admits.
Boredom might be good for you
Time without input seems to help creative thinking.
How vaccines are tested before release
Phases, safety boards and what each stage checks.