Arsenic and TOC are removed from drinking water or wastewaters by use of finely-divided metallic iron in the presence of powered elemental sulfur or other sulfur compounds such as manganese sulfide, followed by an oxidation step. A non-magnetic material is in electrical communication with the LMC layer and provides a spin-balanced source of current to the LMC layer, responsive to the injection of spin-polarized electrons into the LMC layer. The rear of the seat, independent from front adjustments, is adjustable from near ground level to just below armrest level. This trust rating may then be used by the email end user or an inbox service provider to filter spam, if the sender is untrusted, or deliver the message to an inbox, if the sender is trusted. The gateway includes a register for storing information associating the first and second users, and for storing information relating to the current location of the first user so that information from the second user can be directed to the first user. Select memory cells in each row are programmed by band-to-band tunneling.