From VOA Learning English, this is the Technology Report.Testing new drugs for safety and effectiveness is a costly process in the United States.It also can take a lot of time. Some scientists are now designing silicon computer chips that act like human organs.The scientists think they have found a way to make the process faster and more economical.The silicon chips are smaller than a child's hand. Each one has living cells that act and react like a human organ.The chips are being created as part of a program to test the safety of drug compounds.It is called the Tissue Chip for Drug Screening Program.It is a project of the US National Center for Advancing Translational Sciences, or NCATS.Danilo Tagle is the center's Associate Director. He says a three-dimensional computer chip can be designed to act like a human lung.He describes how such a device would operate."In that case, it would be cells representing the air sacs, that would be represented on these bioengineered devices
