Picture this: In the same pediatrician’s office, two little boys happen to have their 3-year-old well visit on the same day. Both start with a nurse, who weighs them and measures their height. Then ...

An infant growth chart tracks a baby’s length, weight, and head circumference over time, comparing them to healthy growth standards. Using WHO or CDC guidelines, charts show percentiles to assess ...

Remember when your child was a baby and you swore they grew overnight? Or that summer when your toddler suddenly looked more ...

UNTIL 1700 the world economy did not really grow—it just stagnated. Over the previous 17 centuries global output had expanded by 0.1% a year on average, a rate at which it takes nearly a millennium ...