Earlier starts tend to be more common in the South and Southwest. Later starts are more common on the East Coast and in the upper Midwest and Northwest.
Compared with 10 years ago, American teens are devoting more of their time in the summer to educational activities and less time to leisure.
For example, about four-in-ten of those who used mail-in DNA testing say they were surprised by results for where ancestors came from.
Around a quarter of college faculty in the U.S. were nonwhite in fall 2017, compared with 45% of students.
The most common age was 11 for Hispanics, 27 for blacks and 29 for Asians as of last July. Multiracial Americans were by far the youngest racial or ethnic group.