Scientists have developed a new type of CAR T-cell therapy that could finally take on stubborn solid tumors like brain and prostate cancer. Called EchoBack CAR T-cells, these immune cells are activated by short bursts of focused ultrasound, which helps them last longer, attack tumors more effectively, and avoid harming healthy tissue. Regular CAR T-cell therapy works well for some blood cancers but struggles with solid tumors because the cells often tire out, disappear too quickly, or mistakenly