Earlier research links just a half an hour's use a day with up to 40% higher odds of brain cancer. Children's maturing brains are especially susceptible, and will have decades of use before middle age. How to negotiate a reasonable relationship with this dangerous technology? Can you turn off your phone when not in use? Or carry it in a purse or bag away from your body? How about texting or using the speaker phone instead of putting the phone directly to your ear? Use old fashioned land line when not in travel?