11.   Researchers have found a direct correlation between smoking and lung cancer.

12.   Now researchers are finding that daydreaming may also be important to mental health.

13.   In an experiment with school children, this same researcher found that daydreaming led the children to pay more attention to detail.

14.   As behavioral sciences develop, however, researchers find the importance of speech has been overestimated.

15.   Eliot says researchers have found that stressed people have higher cholesterol levels, among other things.

16.   The researchers have already found that the simulated effect of global warming in Britain produces two and a half times more new plant growth.

17.   The researchers also found that very low concentrations of a synthetic oestrogen hormone found in contraceptive pills affected fish in the same way.

18.   Now researchers have found a way of using a gene which destroys cancer cells, but does not effect others.

19.   Already researchers are finding patterns in the frequency and magnitude of wars and the jittery leaps and falls of economies.

20.   Already, she said, researchers have found that happiness and unhappiness function in separate circuits of the brain.