A team of scientists have figure out a way to create "virtual objects" you can feel... out of ultrasound.
It sounds like science fiction, and perhaps it is: Researchers have found a way to generate invisible 3-D shapes in the air that can be felt by human hands. The technology, whose main use case is letting surgeons physically "feel" anomalies such as tumors in CT scans, could also revolutionize everything from advertising to architecture.
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