Sound waves can also steer objects inside organisms. Daniel Ahmed, an engineer at ETH Zurich in Switzerland, recently used ultrasound to move hollow plastic beads inside a live zebrafish embryo. By doing these experiments, Ahmed aims to demonstrate the potential of using sound to guide drugs to a target site within an animal, such as a tumor. Similar to the acoustic tweezer, the ultrasound creates a repeating pattern of low and high pressure areas within the embryo, allowing Ahmed to use the pressure pockets to push the beads around. Other researchers are investigating the steering capability of sound to treat kidney
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