21.   Incompetent test-takers had an over-inflated opinion of their abilities, and competent subjects underestimated their powers.

22.   In the case of Viagra, never underestimate the power of sexual expectations.

23.   Indonesia underestimated its power.

24.   It is a mistake to underestimate the power of the press to forge a superstar.

25.   It is never wise to underestimate the power of a president to surprise, snooker and smother us.

26.   Never underestimate the power of a tax break to make investors behave irrationally.

27.   Never underestimate the power of Abby Joseph Cohen.

28.   Never underestimate the power of callousness about faraway people whose relatives in America do not have much campaign money to spread around.

29.   Never underestimate the power of comfort food.

30.   Never underestimate the power of religion.