This last reply is somewhat misguided.
The amount of energy that a wave can expend is a function of its frequency. Power is a function of energy.
Without getting too involved in the details, any higher frequency wave will typically have a greater energy, thus power .. however, power is also a function of
transmission area and
angle of adsorption (d not b).
If you really want something to worry about - it should be UV light - it has enough energy to cause rampant mutations in DNA - specifically
frameshift mutations.
To nit-pick on the "vibrating brain molecule" theory - microwaves work on the principle of rotating water molecules, not vibrating them. The only reason a microwave works is because the resulting wave
resonates at the same
frequency of water. The real danger with wave forms is definately
bond dissociation.
[Edit: Had to add - > Science Rocks]