Kenneth Olden (ed). Describes the analysis & conclusions of the National Institute of Environmental Health Sciences (NIEHS) regarding possible health effects from ELF-EMF (magnetic field) exposures. The NIEHS carried out a hazard evaluation of ELF-EMF exposure that examined both historical & novel scientific evidence on possible health & biological effects at a series of open, scientific meetings. The scientific evidence suggesting that ELF-EMF exposures pose any health risk is weak, & there is a lack of connection between the human data & the experimental data (animal & mechanistic).