What works better: hard, cold technology or arcane, mystical powers? We put that question to a test by seeing which would better help us get home,. We made our start point in the midst of suburban streets near Tiburon, and tried each method to direct us back across the Golden Gate Bridge, into San Francisco. With the Magic 8 Ball, we asked it at each intersection whether we should go right. Using the GPS navigation system, we merely input the address in San Francisco where we wanted to go. The results, as they say, will surprise you. Or maybe not so much.