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Your cover article on using magnetic fields to map and possibly treat brain disorders (“Snap, crackle, and feel good?” SN: 9/23/00, p. 204: Snap, Crackle, and Feel Good?) contrasted sharply with this article a few pages earlier about magnetic fields inducing cells to develop tumors. I would strongly suggest that both the science community and the regulatory community tread carefully until the biological effects of electromagnetic fields are credibly defined.