21.   The discovery came months after committee lawyers had subpoenaed them.

22.   The discovery comes only months after Marjorie Scardino took the helm at Pearson as chief executive.

23.   The discoveries came as crews finally dug into the former lobby of the south tower, one of the few sections at ground zero yet to be fully cleared.

24.   The discovery came just after midnight.

25.   The discoveries have come so fast that even those in the field have barely been able to keep abreast of the results.

26.   The discovery came as a surprise, since there was no previous evidence to suggest that high levels of toxic chemicals occurred in seabirds in remote tropical ocean areas.

27.   The discovery comes only months after Scardino took the helm at Pearson as chief executive.

28.   The justification of unfettered research has been that discoveries often come from unexpected lines of inquiry.

29.   The latest discovery came at a lumberyard in central Florida where the ground was badly contaminated with arsenic compounds from wood preservatives.

30.   Then came the discovery of penicillin, chemotherapy, laser beams.