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In the September SciAm, there is an ad from Honda announcing that the new Prelude Si4WS has 4-wheel steering. There are no computers, wiring or electronic black boxes. The Honda system is mechanical and sure. The article describes a visual version of the file comparator program diff called vdiff. Recently, the staff of the Houses of Parliament have become interested in this work, since they need to monitor changes to Bills as they pass through Parliament.