A new study forecasts more than 850,000 measles cases over the next 25 years if US vaccination rates stay the same. Millions of infections are possible if rates drop.

In her new book, On Muscle, Bonnie Tsui investigates the other stuff our thews remember—like how to grow when you exercise.

Multiple US states have logged record pollen counts this spring, with climate change likely to blame.

The elective medical industry is cashing in on plastic pollution fears, but the evidence of harm from microplastics is still deeply uncertain.