Hartree writes: A World Health Organization group of experts doing a review of previous studies concluded that they could not rule out the the possibility that cell phones increase brain cancer risk. The judge the possibility to be great enough to warrant measures to reduce exposure. Hands free operation or testing were mentioned.
The Tao is like a stack:
the data changes but not the structure.
the more you use it, the deeper it becomes;
the more you talk of it, the less you understand.