Doctors at the University of Sheffield made a significant discovery this week that will improve the process that tests for the best sperm. Their new process allows for the sperm to be tested without destroying the sample. This means that the sperm can be used immediately for in vitro fertilization. The new method uses low energy pulses often used to test cancer cells. This significant discovery will help doctors know they are selecting the best sperm by looking for molecular differences before impregnating the egg.