A three-year-old boy from California is showing amazing progress after taking part in a world-first clinical trial for Hunter’s syndrome involving gene therapy. Born with the rare genetic disease, Oliver Chu faced a future of progressive damage to his body and brain — but nine months after receiving gene-corrected stem cells, his family says his speech and mobility have improved remarkably. "Everything from his learning curve hasn't just gone up, but it's like shot up," Ollie's father said. The