Fergus Walsh, BBC News Medical Correspondent, shows us round the lab where human sperm has been created using stem cell research.
The sperm may lead to future treatments for people who are infertile. But researchers say it will not be used to create human babies - and will not mean the end of men.
The new technique to grow sperm from embryonic stem cells was developed by Newcastle University and the NorthEast England Stem Cell Institute (NESCI).

The Food and Drug Administration said yesterday that it had confirmed the presence of E. coli 0157, a deadly strain of bacteria, in samples of Nestlé Toll House refrigerated cookie dough produced at the company's plant in Danville, Va.

Investigators did not find the bacterium inside the factory or on equipment but in a tub of chocolate cookie dough made at the site in February, said David Acheson, assistant commissioner for food safety at the FDA. The dough had a June 10 expiration date.

Baxter International Inc. said it is in "full scale" production of a vaccine for the H1N1 virus, known as swine flu, and anticipates the first commercially available dosages to be ready in early July.

The announcement Friday by the Deerfield-based medical-product giant comes a day after the World Health Organization declared a global pandemic.

Fioricet is one of the more popular pain relief medications being prescribed by doctors. It is a combination of Acetaminophen, Butalbital, and caffeine. This is commonly prescribed for migraines and other pain related conditions.

The new H1N1 influenza virus quickened its spread across the United States, but health officials said on Friday they were encouraged that more people were washing their hands as a result of the outbreak.

States reported 2,500 probable and confirmed cases of the swine flu, acting Centres for Disease Control and Prevention director Dr. Richard Besser told reporters.