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Men could be inadvertently damaging their chances of becoming a father by keeping a mobile phone in their trouser pocket, a new study suggests.
Exposure to radio-frequency electromagnetic radiation from mobiles negatively affected sperm quality, according to scientists at the University of Exeter, who also admitted further research was needed.
Previous studies have suggested that radio-frequency electromagnetic radiation emitted by the devices can have a detrimental effect on male fertility.
Dr Fiona Mathews, of the University of Exeter, who led the study, said: "This study strongly suggests that being exposed to radio-frequency electromagnetic radiation from carrying mobiles in trouser pockets negatively affects sperm quality.
"This could be particularly important for men already on the borderline of infertility, and further research is required to determine the full clinical implications for the general population."
The world's biggest investigation into the effects of mobile phones on the developing brains of children has been commissioned by the Department of Health.
Scientists have launched the Study of Cognition, Adolescents and Mobile Phones (Scamp) will focus on mental functions such as memory and attention which continue to develop into the teenage years.
About 2,500 school children will be tested at age 11 and 12 and undergo a further assessment two years later. Most children start to own a mobile phone at around 11 or 12.
Invitations have been sent out to more than 160 secondary schools in the outer London area to enrol pupils into the study.
A Government study into the effect mobiles have on a child's brain will "provide the evidence base with which to inform policy", the investigation's chief said.
Scamp's principal investigator Dr Mireille Toledano, from Imperial College London, explained:
As mobile phones are a new and widespread technology central to our lives, carrying out the Scamp study is important in order to provide the evidence base with which to inform policy and through which parents and their children can make informed life choices.
By assessing the children in year seven and again in year nine we will be able to see how their cognitive abilities develop in relation to changing use of mobile phones and other wireless technologies.
The "world's biggest investigation" into the effects on the developing brains of children has been launched, the Department of Health has announced.
An estimated 2,500 school children will take part in the Study of Cognition, Adolescents and Mobile Phones (Scamp) as they have functions like memory and attention span tested.
Children aged between 11 and 12 will take part in an initial series of tests before being examined again two years later.
The World Health Organisation (WHO) ranked forward-looking studies of the effects of mobile phones on children and adolescents as a "highest priority research need".
Almost half of those surveyed said that if their mobile phone died they would only be able to remember three phone numbers - and more than 70% said they would give up having pudding after a meal in order to have a fully charged smartphone for a month.
Kevin Malinowski, a spokesman for mophie, said:
Millions of people rely on their smartphones daily to stay in touch with loved ones and do work on the move.
But all of these activities hinge on a single factor: having enough juice to keep the phones running.
A dead battery in a smartphone would cause more stress for nine out of 10 Britons, as daily activities hinge on a single factor "having enough juice to keep the phones running," says a report by smartphone case maker mophie.
According to the research, 92% of British people would feel stressed if the battery in their smartphone ran out, 61% said they would become frustrated, with 25% saying they would feel panicked.
Experts have suggested people should resist the urge of taking their devices to bed, and try to have set unplugged periods during the week.