Humans grew 4 inches in 100 years Humans grew 4 inches in 100 years Humans grew 4 inches in 100 years a bit taller Humans grew 4 inches in 100 years has increased four inches in the past 100 years has increased four inches in the past 100 years Humans grew 4 inches in 100 years original article Humans grew 4 inches in 100 years has increased four inches in the past 100 years increase in average human height