Some scientists say they've figured out how to safely 'shut off' genes. It could potentially lead to curing some genetic diseases. "Gene editing," using something called the 'crisper' system, has been around for a few years. But a team at the University of Virginia says it found a way to 'silence' genes without harming surrounding cells. The discovery could eventually help doctors turn off genes that are making patients sick. it will also help scientists be able to more directly research genes individually. among the diseases that doctors could possibly treat with the gene-silencing method are cystic fibrosis and hemophilia.