Changed study 2 to the current version of study 2.

-Everyone is in the high-meaning condition
-Only the trivia task is used.
-Trivia questions now easy 4, 2 difficult (chosen randomly from 14 hard
questions)
-Subjects should not respond if they don't know the answer.
-Disfluencies toned down.
-Misleading example task was removed.
-The affirmation tasks only contain 4 items, since the effect of the
manipulation is weak already.