British scientists claim a first in medical history by using embryonic stem cells to create human sperm in a laboratory. Researchers at Newcastle Uni hope it will help infertile couples but it has sparked an ethical debate. Sky's Gerard Tubb reports. In a world first, British scientists have grown human sperm in the laboratory. The breakthrough in stem cell science offers a potential cure for male infertility and could be used in IVF clinics in as little as five years. It would allow ...