Researchers offered 11th-graders a free SAT prep course, but they used two different sign-up sheets, to see how teens respond to peer pressure. The sign-up sheet said:
Your decision to sign up for the course will be kept completely private from everyone, except the other students in the room.
Or:
Your decision to sign up for the course will be kept completely private from everyone, including the other students in the room.
If they passed out the sign-up sheet in an honors class, then the “public decision” sign-up sheet got more students to sign up, in a non-honors class fewer:
Two colors:
Black and yellow
Maybe with an admixture of brown.