New research indicates that heat from laptop computers can potentially be damaging to uh, the family.  The heat generated by laptop computers can now be linked to fertility problems.  The experts are urging male laptop users to place the computer on a desk or table, rather than on their lap, or even knees.

Scientists from the State University of New York at Stony Brook evaluated 29 male volunteers and measured the temperatures of the scrotum. They also kept track of the laptop and lap pad temperatures during three 60-minute sessions as the volunteers sat in various positions.

After an hour with a laptop on their knees, the temperature of their testicles rose more than four degrees Fahrenheit. The scientists indicated in the report that previous research has shown that a raised temperature of 1.8 degrees Fahrenheit can damage sperm.

via Laptops Might Cause Fertility Issues in Men | Laptops Overheating Testicles, Fertility & Sperm Quality | Tech News Daily.

The scientists went on to say that even if the temperature of the testicles is raised for only 10 or fifteen minutes, damage can occur.  It's also important to note that this rise in temperature is usually not detected by the man.