Talking for four hours a day could make you infertile, scientists warn. Mobile phones may be causing widespread damage to sperm production in men with potentially devastating consequences for global fertility rates, a study suggests. Microwaves emitted by the phones reduce the number, mobility and quality of sperm by almost half in the heaviest users, to the point where some men may become infertile, scientists say. Almost a billion people around the world are using mobile phones and the number is growing fast. Even a small effect on fertility caused by their use could result in millions of men being rendered childless. Concern has grown about the effects of mobile phones for a decade, but very little hard evidence of the dangers has been presented. Scientists from the Reproductive Research Centre at the Cleveland Clinic Foundation, Ohio, tested the sperm of 364 men who were being investigated for infertility with their partners. They found that men who were the heaviest users of mobile phones – more than four hours a day – had the lowest sperm counts at 50 million per millilitre and the least healthy sperm, judged by its mobility and the proportion […]