One way sound: A new material will allow for improved ultrasound imaging

Most roads allow cars to flow in both directions. However, in some circumstances, such as congested city streets, it makes sense to limit traffic to one direction only. With electricity it is also useful to "rectify"currents -- that is, make them move in one direction -- using things called diodes. One-way electricity is handy since it enables transistors to be turned on and off, among other things.

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