21.   But one contributing scientist cautioned there may be other, more routine causes for the sea surges and other recent incidents.

22.   But scientists cautioned it was only a first step.

23.   Other scientists cautioned that the virus may not be a new health threat, but only went undiscovered before.

24.   Scientists caution that other types of microscopic sea life also can produce toxins.

25.   Scientists caution that they need more answers before they can tell if such screening is justified.

26.   A political scientist cautioned ordinairy Lebanese would be especially shaken by the murder of Irani.

27.   The scientists cautioned that kicking the habit, not taking vitamins, is the best approach for smokers.