11.   With the printed word, the slower process of turning the pages can sometimes lead a researcher to lucky discoveries.

12.   Poison chemical from frog leads researchers to new painkiller.

13.   An experiment that altered human genes in such a way that could affect future generations has led two researchers to recommend federal regulation of fertility clinics.

14.   So lead researcher Hassan Jomaa of Justus-Liebig University and colleagues tested whether it also would target the enzyme in the malaria parasite.

15.   The European researchers were led by Angelo Spena of the University of Verona in Italy.

16.   The recent discoveries have led researchers to the conclusion that REM is merely a trigger for dreaming.

17.   The researchers were led by Dr. Frank B. Hu of the Harvard School of Public Health.