Victoria: I'd like some euros buy zithromax online usa In typical conductors like copper, the atoms occupy fixed positions, passing electrons from one to another down the chain. But in ionic conductors the ions actually move from one location to another inside the structure. That means the conductor can be stretched to several times its size without an increase in resistivity, so it's still easy for current to pass through the system. That property ideally makes ionics more practical for the flexible electronics of the future. Ionic conductors aren't a new idea, but their propensity for breaking down under high voltage led many to think they were impractical. However, the Harvard team found a way to prevent unwanted chemical reactions from taking place in the system by using rubber as an insulator, controlling the voltage where the gel contacts the electrodes.