WASHINGTON — The hottest tool in biology has scientists using words like revolutionary as they describe the long-term potential: Wiping out certain mosquitoes that carry malaria, treating genetic diseases like sickle cell, preventing babies from inheriting life-threatening disorders.It may sound like sci-fi, but research into genome editing is booming. So is a debate about its boundaries, what’s safe and what’s ethical to try in the quest to fight disease.Does the promise warrant experimenting with human …