All these reports about cellphones causing/not causing cancer are giving me a headache. The Economist has the lowdown with reasons for the contradicting reports:

The contradictory headlines are the result of national research teams releasing single-country reports, despite the fact that these inevitably involve smaller samples. The results from nine of the 13 single-country studies have been made available in this way, and the consequence is a farrago of misinformation. Many of the national reports suggest, for example, that ever having been a regular mobile-phone user offers statistically significant protection against some brain tumours. This finding is so counter-intuitive that it has led most of the people involved to acknowledge serious flaws in the study’s design.