At the target, it stimulates approximately 1 cubic centimeter of brain tissue, "about the size of a pea, " according to Gross.

CNN: Treating depression with electrodes inside the brain

In the most serious known injuries due to radiation at Fukushima, three workers who suffered radiation burns inside the turbine building beside Reactor No. 3, are now reported to have been standing in water that tested 3.9 becquerels of radioactivity per cubic centimeter a figure that is 10, 000 times higher that what is normally found inside a functioning nuclear power vessel.

FORBES: Japan's Government Expands Danger Zone; Unit 3 Breach 'Likely'