Sound Bullets - Innovation Nation

The video discusses the development of sound bullets, which are focused acoustic impulses created using a sound lens. Researchers at Caltech, with support from the National Science Foundation, are working on adjusting the lens to focus sound waves for potential applications in medical imaging and therapy. These sound bullets could be used to precisely target and shrink tumors by heating them, representing a promising future in medical technology.

What is meant by the term 'sound bullet' as described in the text?

In what way could the vibrations from these 'friendly bullets' be beneficial in medical treatment?