One letter in 3,000,000,000. That’s all it took to nearly end a life. This baby was born with a single DNA typo in his liver. One wrong base pair broke a critical enzyme, meaning his body couldn’t process ammonia. Every time he ate protein, toxic waste built up in his blood and brain. Without intervention, this condition is usually fatal. Doctors didn’t replace the organ. They didn’t prescribe lifelong medication. They rewrote the instruction manual instead. 🧬 Using modern gene editing, they corrected the mutation inside his body, allowing his liver cells to function normally. This is one of the clearest examples yet of medicine shifting from managing symptoms to fixing root causes. This is STEM at its most human: molecular biology, genetics, and engineering converging to save a real life. We’re still early. It’s not risk-free. It won’t work for everything. But this moment marks a turning point. Would you trust gene editing if it meant saving a life you love? Comment your though...