EVEN if you’re not in Flint, Mich., there are toxic chemicals in your home. For that matter, in you. Scientists have identified more than 200 industrial chemicals — from pesticides, flame retardants, jet fuel — as well as neurotoxins like lead in the blood or breast milk of Americans, indeed, in people all over our planet. These have been linked to cancer, genital deformities, lower sperm count, obesity and diminished I.Q. Medical organizations from the President’s Cancer Panel to the International Federation of Gynecology and Obstetrics have demanded tougher regulations or warned people to avoid them, and the cancer panel has warned that “to a disturbing extent, babies are born ‘pre-polluted.’”