21.   Ms. Wilson said the report accepted previous research arguing that children imitate the violence they see on television, a point that broadcasters have vigorously protested as totally unproven.

22.   Pierce agreed, saying all previous research focused on the time that children take up smoking regularly.

23.   Power also pays in the chimp colony, the new research suggests, also contradicting previous research.

24.   Previous research at the site has shown that a drier climate can bring on acid pulses as a result of complex chemical reactions.

25.   Previous research has established that the youngest girls are the most likely to participate in sex characterized as voluntary, but unwanted.

26.   Previous research has found certain differences in brain structures as well as other anatomical distinctions between gays and straights.

27.   Previous research has shown that wealthier women with private insurance also are more likely to have a Caesarean delivery than other women.

28.   Previous research has suggested that dissatisfaction was a major factor in the growing popularity of alternative medicine.

29.   Previous research would help authorities decide when the air is safe and who needs medical attention.

30.   Previous research, in fact, showed that administering clot-dissolving drugs could do more harm than good because of the brain-hemorrhage problem.