21.   Federal investigators discovered corrosion in the pipeline that exploded early Saturday in southeastern New Mexico, killing members of three generations of one family.

22.   Federal investigators quickly discover letters from several prominent supporters and financial backers of the raid that strongly suggest the existence of a conspiracy.

23.   He said that investigators discovered the fraudulent Fair Hearing claims in part by checking whether hearings had actually been held.

24.   He was arrested when a U.S. Customs investigator discovered the drugs at the border.

25.   He was building a radio antenna to test that idea when two other investigators, Drs. Robert Wilson and Arno Penzias, discovered the echo by accident.

26.   In addition to the scheme involving corrections officers, investigators discovered two other tax-evasion movements that appeared to have taken place separately and coincidentally.

27.   In that case, investigators discovered the axle of the rented van that carried the bomb.

28.   Investigators discovered that the temperature was certainly high enough to generate fumes.

29.   Investigators did not discover that the White House had been pierced by one of the bullets until Saturday afternoon.

30.   Investigators discovered his identity by using a vehicle-identification number on the car, which was left a paintless, burned-out hulk.