Abstract: An iron-air battery including an iron electrode in contact with an anode current collector, wherein the iron electrode includes a plurality of channels; an oxygen reduction reaction electrode having a first surface facing the plurality of channels and an opposing second surface in contact with air; an oxygen evolution reaction electrode interdigitated with the plurality of channels of the iron electrode, wherein at least a portion of the oxygen evolution reaction electrode is disposed within the plurality of channels in a direction perpendicular to a plane of the oxygen reduction reaction electrode; and an electrolyte in contact with the iron electrode, the first surface of the oxygen reduction reaction electrode, the plurality of channels, and the oxygen evolution reaction electrode.

Abstract: A computer-implemented technique includes receiving, at a computing device including one or more processors, a source document for a web page from a server, the source document including program code and information representing a table of the web page. The technique includes determining a range of pixel positions for each header cell element of the table, wherein the header cell elements represent cells of a top row of the table. The technique includes receiving input from a user, the input indicating an interaction by the user at a position within the table of the web page. The technique includes selecting a column of the table based on the position of the user interaction and the ranges of pixel positions to obtain a selected column. The technique also includes executing a portion of the program code associated with the selected column.