1.   Because the sun is a common and ordinary star, scientists reasoned, groups of planets probably formed around some other stars like it.

2.   More sand at a particular time, the scientists reasoned, signified more sea ice and thus a movement of cold water southward.

3.   Perhaps porpoises and dolphins competed for food, the scientists reasoned, or perhaps the porpoises were seen as a threat to young or ill dolphins.

4.   Scientists reasoned that the strong tidal forces of Jupiter caused regular expansions and contractions of Europa.

5.   So scientists reasoned that if the same pattern occurred in Tokai, an earthquake could be predicted.

6.   Some scientists reason that humans also release and react to pheromone messages.

7.   The searing heat of such a collision, the Tucson scientists reasoned, could explain why the moon held no water and few volatile elements.

8.   So scientists reason that antiviral drugs already on the market for other uses might stop smallpox, just as one antibiotic can kill many kinds of bacteria.