The granite used to build the US Capitol is so radioactive that the building would fail federal safety codes regulating nuclear power plants. All living tissue is radioactive to some degree: human beings, like bananas, emit radiation because both contain small amounts of the radioisotope potassium 40; muscle contains more potassium 40 than other tissue, so men are generally more radioactive than women. Brazil nuts, with a thousand times the average concentration of radium
